55120564321523 has 4 divisors (see below), whose sum is σ = 55517115144120. Its totient is φ = 54724013498928.

The previous prime is 55120564321507. The next prime is 55120564321561. The reversal of 55120564321523 is 32512346502155.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55120564321523 - 2⁴ = 55120564321507 is a prime.

It is a super-2 number, since 2×55120564321523² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55120564321723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198275411090 + ... + 198275411367.

It is an arithmetic number, because the mean of its divisors is an integer number (13879278786030).

Almost surely, 2^{55120564321523} is an apocalyptic number.

55120564321523 is a deficient number, since it is larger than the sum of its proper divisors (396550822597).

55120564321523 is a wasteful number, since it uses less digits than its factorization.

55120564321523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396550822596.

The product of its (nonzero) digits is 1080000, while the sum is 44.

The spelling of 55120564321523 in words is "fifty-five trillion, one hundred twenty billion, five hundred sixty-four million, three hundred twenty-one thousand, five hundred twenty-three".