642370155643266 has 16 divisors (see below), whose sum is σ = 1284740560479744. Its totient is φ = 214123343682224.

The previous prime is 642370155643199. The next prime is 642370155643277. The reversal of 642370155643266 is 662346551073246.

It is a happy number.

It is a super-2 number, since 2×642370155643266² (a number of 30 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51492511 + ... + 62739293.

It is an arithmetic number, because the mean of its divisors is an integer number (80296285029984).

Almost surely, 2^{642370155643266} is an apocalyptic number.

642370155643266 is an abundant number, since it is smaller than the sum of its proper divisors (642370404836478).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642370155643266 is a wasteful number, since it uses less digits than its factorization.

642370155643266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20766105.

The product of its (nonzero) digits is 130636800, while the sum is 60.

The spelling of 642370155643266 in words is "six hundred forty-two trillion, three hundred seventy billion, one hundred fifty-five million, six hundred forty-three thousand, two hundred sixty-six".