56642120542251 has 24 divisors (see below), whose sum is σ = 82567755372960. Its totient is φ = 37414638896256.

The previous prime is 56642120542247. The next prime is 56642120542261. The reversal of 56642120542251 is 15224502124665.

56642120542251 is a `hidden beast` number, since 5 + 6 + 6 + 4 + 212 + 0 + 5 + 422 + 5 + 1 = 666.

It is not a de Polignac number, because 56642120542251 - 2² = 56642120542247 is a prime.

It is a super-2 number, since 2×56642120542251² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 56642120542197 and 56642120542206.

It is not an unprimeable number, because it can be changed into a prime (56642120542261) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 154101250 + ... + 154468376.

It is an arithmetic number, because the mean of its divisors is an integer number (3440323140540).

Almost surely, 2^{56642120542251} is an apocalyptic number.

56642120542251 is a deficient number, since it is larger than the sum of its proper divisors (25925634830709).

56642120542251 is a wasteful number, since it uses less digits than its factorization.

56642120542251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524515 (or 524512 counting only the distinct ones).

The product of its (nonzero) digits is 1152000, while the sum is 45.

The spelling of 56642120542251 in words is "fifty-six trillion, six hundred forty-two billion, one hundred twenty million, five hundred forty-two thousand, two hundred fifty-one".