55776944921 has 4 divisors (see below), whose sum is σ = 55778814672. Its totient is φ = 55775075172.

The previous prime is 55776944893. The next prime is 55776944929. The reversal of 55776944921 is 12944967755.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-55776944921 is a prime.

It is a super-2 number, since 2×55776944921² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55776944929) 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, 889391 + ... + 950036.

It is an arithmetic number, because the mean of its divisors is an integer number (13944703668).

Almost surely, 2^55776944921 is an apocalyptic number.

It is an amenable number.

55776944921 is a deficient number, since it is larger than the sum of its proper divisors (1869751).

55776944921 is a wasteful number, since it uses less digits than its factorization.

55776944921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1869750.

The product of its digits is 19051200, while the sum is 59.

The spelling of 55776944921 in words is "fifty-five billion, seven hundred seventy-six million, nine hundred forty-four thousand, nine hundred twenty-one".