55143032520 has 64 divisors (see below), whose sum is σ = 171133560000. Its totient is φ = 14197745408.

The previous prime is 55143032509. The next prime is 55143032537. The reversal of 55143032520 is 2523034155.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 7919370 + ... + 7926329.

It is an arithmetic number, because the mean of its divisors is an integer number (2673961875).

Almost surely, 2^55143032520 is an apocalyptic number.

It is an amenable number.

55143032520 is an abundant number, since it is smaller than the sum of its proper divisors (115990527480).

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

55143032520 is a wasteful number, since it uses less digits than its factorization.

55143032520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15845742 (or 15845738 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 30.

Adding to 55143032520 its reverse (2523034155), we get a palindrome (57666066675).

The spelling of 55143032520 in words is "fifty-five billion, one hundred forty-three million, thirty-two thousand, five hundred twenty".