55563001644 has 48 divisors (see below), whose sum is σ = 131782359296. Its totient is φ = 18216792000.

The previous prime is 55563001609. The next prime is 55563001661. The reversal of 55563001644 is 44610036555.

It is a super-2 number, since 2×55563001644² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 479169 + ... + 583719.

Almost surely, 2^55563001644 is an apocalyptic number.

It is an amenable number.

55563001644 is an abundant number, since it is smaller than the sum of its proper divisors (76219357652).

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

55563001644 is a wasteful number, since it uses less digits than its factorization.

55563001644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105286 (or 105284 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 39.

The spelling of 55563001644 in words is "fifty-five billion, five hundred sixty-three million, one thousand, six hundred forty-four".