56155404220 has 24 divisors (see below), whose sum is σ = 117945299808. Its totient is φ = 22458552000.

The previous prime is 56155404211. The next prime is 56155404223. The reversal of 56155404220 is 2240455165.

It is a super-2 number, since 2×56155404220² (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 (56155404223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96231 + ... + 348670.

It is an arithmetic number, because the mean of its divisors is an integer number (4914387492).

Almost surely, 2^56155404220 is an apocalyptic number.

It is an amenable number.

56155404220 is an abundant number, since it is smaller than the sum of its proper divisors (61789895588).

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

56155404220 is a wasteful number, since it uses less digits than its factorization.

56155404220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451221 (or 451219 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 34.

Adding to 56155404220 its reverse (2240455165), we get a palindrome (58395859385).

The spelling of 56155404220 in words is "fifty-six billion, one hundred fifty-five million, four hundred four thousand, two hundred twenty".