642611166351 has 48 divisors (see below), whose sum is σ = 1087422433920. Its totient is φ = 333790201920.

The previous prime is 642611166343. The next prime is 642611166377. The reversal of 642611166351 is 153661116246.

It is not a de Polignac number, because 642611166351 - 2³ = 642611166343 is a prime.

It is a super-2 number, since 2×642611166351² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642611166341) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 28248940 + ... + 28271678.

It is an arithmetic number, because the mean of its divisors is an integer number (22654634040).

Almost surely, 2^642611166351 is an apocalyptic number.

642611166351 is a deficient number, since it is larger than the sum of its proper divisors (444811267569).

642611166351 is a wasteful number, since it uses less digits than its factorization.

642611166351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40244 (or 40237 counting only the distinct ones).

The product of its digits is 155520, while the sum is 42.

The spelling of 642611166351 in words is "six hundred forty-two billion, six hundred eleven million, one hundred sixty-six thousand, three hundred fifty-one".