55140441286921 has 3 divisors (see below), whose sum is σ = 55140448712583. Its totient is φ = 55140433861260.

The previous prime is 55140441286919. The next prime is 55140441286963. The reversal of 55140441286921 is 12968214404155.

The square root of 55140441286921 is 7425661.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 55139371996921 + 1069290000 = 7425589^2 + 32700^2 .

It is not a de Polignac number, because 55140441286921 - 2¹ = 55140441286919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55140441286981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 3712831 + ... + 11138491.

It is an arithmetic number, because the mean of its divisors is an integer number (18380149570861).

Almost surely, 2^{55140441286921} is an apocalyptic number.

55140441286921 is the 7425661-st square number.

55140441286921 is the 3712831-st centered octagonal number.

It is an amenable number.

55140441286921 is a deficient number, since it is larger than the sum of its proper divisors (7425662).

55140441286921 is an frugal number, since it uses more digits than its factorization.

55140441286921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14851322 (or 7425661 counting only the distinct ones).

The product of its (nonzero) digits is 2764800, while the sum is 52.

The spelling of 55140441286921 in words is "fifty-five trillion, one hundred forty billion, four hundred forty-one million, two hundred eighty-six thousand, nine hundred twenty-one".