55616728409 has 16 divisors (see below), whose sum is σ = 64100401920. Its totient is φ = 47778514560.

The previous prime is 55616728397. The next prime is 55616728439. The reversal of 55616728409 is 90482761655.

It is a cyclic number.

It is not a de Polignac number, because 55616728409 - 2⁴ = 55616728393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55616728439) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1839764 + ... + 1869749.

It is an arithmetic number, because the mean of its divisors is an integer number (4006275120).

Almost surely, 2^55616728409 is an apocalyptic number.

It is an amenable number.

55616728409 is a deficient number, since it is larger than the sum of its proper divisors (8483673511).

55616728409 is a wasteful number, since it uses less digits than its factorization.

55616728409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3709600.

The product of its (nonzero) digits is 3628800, while the sum is 53.

The spelling of 55616728409 in words is "fifty-five billion, six hundred sixteen million, seven hundred twenty-eight thousand, four hundred nine".