642257465511 has 32 divisors (see below), whose sum is σ = 875647438848. Its totient is φ = 418579499520.

The previous prime is 642257465483. The next prime is 642257465567. The reversal of 642257465511 is 115564752246.

It is not a de Polignac number, because 642257465511 - 2¹³ = 642257457319 is a prime.

It is a super-2 number, since 2×642257465511² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642257465711) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 118254966 + ... + 118260396.

It is an arithmetic number, because the mean of its divisors is an integer number (27363982464).

Almost surely, 2^642257465511 is an apocalyptic number.

642257465511 is a deficient number, since it is larger than the sum of its proper divisors (233389973337).

642257465511 is a wasteful number, since it uses less digits than its factorization.

642257465511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8031.

The product of its digits is 2016000, while the sum is 48.

The spelling of 642257465511 in words is "six hundred forty-two billion, two hundred fifty-seven million, four hundred sixty-five thousand, five hundred eleven".