55613530644 has 48 divisors (see below), whose sum is σ = 150391535616. Its totient is φ = 15665781600.

The previous prime is 55613530631. The next prime is 55613530667. The reversal of 55613530644 is 44603531655.

It is a super-2 number, since 2×55613530644² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 55613530596 and 55613530605.

It is a congruent number.

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, 4656472 + ... + 4668399.

It is an arithmetic number, because the mean of its divisors is an integer number (3133156992).

Almost surely, 2^55613530644 is an apocalyptic number.

It is an amenable number.

55613530644 is an abundant number, since it is smaller than the sum of its proper divisors (94778004972).

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

55613530644 is a wasteful number, since it uses less digits than its factorization.

55613530644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9324956 (or 9324954 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 42.

The spelling of 55613530644 in words is "fifty-five billion, six hundred thirteen million, five hundred thirty thousand, six hundred forty-four".