55121555331 has 6 divisors (see below), whose sum is σ = 79620024380. Its totient is φ = 36747703548.

The previous prime is 55121555309. The next prime is 55121555341. The reversal of 55121555331 is 13355512155.

55121555331 is a `hidden beast` number, since 5 + 51 + 21 + 5 + 553 + 31 = 666.

It is not a de Polignac number, because 55121555331 - 2⁶ = 55121555267 is a prime.

It is a super-2 number, since 2×55121555331² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55121555341) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3062308621 + ... + 3062308638.

Almost surely, 2^55121555331 is an apocalyptic number.

55121555331 is a deficient number, since it is larger than the sum of its proper divisors (24498469049).

55121555331 is a wasteful number, since it uses less digits than its factorization.

55121555331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6124617265 (or 6124617262 counting only the distinct ones).

The product of its digits is 56250, while the sum is 36.

The spelling of 55121555331 in words is "fifty-five billion, one hundred twenty-one million, five hundred fifty-five thousand, three hundred thirty-one".