55616539621 has 4 divisors (see below), whose sum is σ = 55617277312. Its totient is φ = 55615801932.

The previous prime is 55616539609. The next prime is 55616539631. The reversal of 55616539621 is 12693561655.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55616539621 - 2⁹ = 55616539109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55616539631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 240981 + ... + 411466.

It is an arithmetic number, because the mean of its divisors is an integer number (13904319328).

Almost surely, 2^55616539621 is an apocalyptic number.

It is an amenable number.

55616539621 is a deficient number, since it is larger than the sum of its proper divisors (737691).

55616539621 is an equidigital number, since it uses as much as digits as its factorization.

55616539621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 737690.

The product of its digits is 1458000, while the sum is 49.

The spelling of 55616539621 in words is "fifty-five billion, six hundred sixteen million, five hundred thirty-nine thousand, six hundred twenty-one".