55527357821 has 16 divisors (see below), whose sum is σ = 61775712768. Its totient is φ = 49564008000.

The previous prime is 55527357817. The next prime is 55527357857. The reversal of 55527357821 is 12875372555.

It is a happy number.

It is not a de Polignac number, because 55527357821 - 2² = 55527357817 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55527357821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55527357871) 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, 471350 + ... + 577256.

It is an arithmetic number, because the mean of its divisors is an integer number (3860982048).

Almost surely, 2^55527357821 is an apocalyptic number.

It is an amenable number.

55527357821 is a deficient number, since it is larger than the sum of its proper divisors (6248354947).

55527357821 is a wasteful number, since it uses less digits than its factorization.

55527357821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107252.

The product of its digits is 2940000, while the sum is 50.

The spelling of 55527357821 in words is "fifty-five billion, five hundred twenty-seven million, three hundred fifty-seven thousand, eight hundred twenty-one".