55777219900 has 18 divisors (see below), whose sum is σ = 121036567400. Its totient is φ = 22310887920.

The previous prime is 55777219853. The next prime is 55777219909. The reversal of 55777219900 is 991277755.

It is a super-2 number, since 2×55777219900² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55777219909) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 278886000 + ... + 278886199.

Almost surely, 2^55777219900 is an apocalyptic number.

55777219900 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

55777219900 is an abundant number, since it is smaller than the sum of its proper divisors (65259347500).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55777219900 is a wasteful number, since it uses less digits than its factorization.

55777219900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557772213 (or 557772206 counting only the distinct ones).

The product of its (nonzero) digits is 1389150, while the sum is 52.

The spelling of 55777219900 in words is "fifty-five billion, seven hundred seventy-seven million, two hundred nineteen thousand, nine hundred".