642962197818 has 128 divisors (see below), whose sum is σ = 1579214154240. Its totient is φ = 192871895040.

The previous prime is 642962197781. The next prime is 642962197837. The reversal of 642962197818 is 818791269246.

642962197818 is a `hidden beast` number, since 6 + 429 + 6 + 2 + 197 + 8 + 18 = 666.

It is a super-2 number, since 2×642962197818² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 93763846 + ... + 93770702.

It is an arithmetic number, because the mean of its divisors is an integer number (12337610580).

Almost surely, 2^642962197818 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 642962197818, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (789607077120).

642962197818 is an abundant number, since it is smaller than the sum of its proper divisors (936251956422).

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

642962197818 is a wasteful number, since it uses less digits than its factorization.

642962197818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11349 (or 11343 counting only the distinct ones).

The product of its digits is 20901888, while the sum is 63.

The spelling of 642962197818 in words is "six hundred forty-two billion, nine hundred sixty-two million, one hundred ninety-seven thousand, eight hundred eighteen".