655122021651 has 12 divisors (see below), whose sum is σ = 947075296440. Its totient is φ = 436384353600.

The previous prime is 655122021643. The next prime is 655122021677. The reversal of 655122021651 is 156120221556.

655122021651 is a `hidden beast` number, since 6 + 551 + 2 + 20 + 21 + 65 + 1 = 666.

It is not a de Polignac number, because 655122021651 - 2³ = 655122021643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (655122022651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30293661 + ... + 30315278.

It is an arithmetic number, because the mean of its divisors is an integer number (78922941370).

Almost surely, 2^655122021651 is an apocalyptic number.

655122021651 is a deficient number, since it is larger than the sum of its proper divisors (291953274789).

655122021651 is a wasteful number, since it uses less digits than its factorization.

655122021651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60610146 (or 60610143 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

The spelling of 655122021651 in words is "six hundred fifty-five billion, one hundred twenty-two million, twenty-one thousand, six hundred fifty-one".