56155051221 has 8 divisors (see below), whose sum is σ = 75899064960. Its totient is φ = 36923869152.

The previous prime is 56155051201. The next prime is 56155051237. The reversal of 56155051221 is 12215055165.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 56155051221 - 2²⁶ = 56087942357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56155051201) 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, 128207661 + ... + 128208098.

It is an arithmetic number, because the mean of its divisors is an integer number (9487383120).

Almost surely, 2^56155051221 is an apocalyptic number.

It is an amenable number.

56155051221 is a deficient number, since it is larger than the sum of its proper divisors (19744013739).

56155051221 is a wasteful number, since it uses less digits than its factorization.

56155051221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256415835.

The product of its (nonzero) digits is 15000, while the sum is 33.

The spelling of 56155051221 in words is "fifty-six billion, one hundred fifty-five million, fifty-one thousand, two hundred twenty-one".