642240293331 has 32 divisors (see below), whose sum is σ = 1057117024768. Its totient is φ = 337740606720.

The previous prime is 642240293323. The next prime is 642240293341. The reversal of 642240293331 is 133392042246.

It is not a de Polignac number, because 642240293331 - 2³ = 642240293323 is a prime.

It is a super-2 number, since 2×642240293331² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 642240293331.

It is not an unprimeable number, because it can be changed into a prime (642240293341) 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, 3463306 + ... + 3644031.

It is an arithmetic number, because the mean of its divisors is an integer number (33034907024).

Almost surely, 2^642240293331 is an apocalyptic number.

642240293331 is a deficient number, since it is larger than the sum of its proper divisors (414876731437).

642240293331 is a wasteful number, since it uses less digits than its factorization.

642240293331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7107691.

The product of its (nonzero) digits is 186624, while the sum is 39.

The spelling of 642240293331 in words is "six hundred forty-two billion, two hundred forty million, two hundred ninety-three thousand, three hundred thirty-one".