55728718536961 has 4 divisors (see below), whose sum is σ = 55728736991572. Its totient is φ = 55728700082352.

The previous prime is 55728718536943. The next prime is 55728718536989. The reversal of 55728718536961 is 16963581782755.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12150975930625 + 43577742606336 = 3485825^2 + 6601344^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55728718536961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55728718536941) 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, 3521610 + ... + 11129203.

It is an arithmetic number, because the mean of its divisors is an integer number (13932184247893).

Almost surely, 2^{55728718536961} is an apocalyptic number.

It is an amenable number.

55728718536961 is a deficient number, since it is larger than the sum of its proper divisors (18454611).

55728718536961 is a wasteful number, since it uses less digits than its factorization.

55728718536961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18454610.

The product of its digits is 762048000, while the sum is 73.

The spelling of 55728718536961 in words is "fifty-five trillion, seven hundred twenty-eight billion, seven hundred eighteen million, five hundred thirty-six thousand, nine hundred sixty-one".