642653195520 has 144 divisors (see below), whose sum is σ = 2345684261760. Its totient is φ = 146892152832.

The previous prime is 642653195441. The next prime is 642653195633. The reversal of 642653195520 is 25591356246.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 642653195520.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11927235 + ... + 11980994.

It is an arithmetic number, because the mean of its divisors is an integer number (16289474040).

Almost surely, 2^642653195520 is an apocalyptic number.

642653195520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

642653195520 is an abundant number, since it is smaller than the sum of its proper divisors (1703031066240).

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

642653195520 is a wasteful number, since it uses less digits than its factorization.

642653195520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23908260 (or 23908246 counting only the distinct ones).

The product of its (nonzero) digits is 1944000, while the sum is 48.

The spelling of 642653195520 in words is "six hundred forty-two billion, six hundred fifty-three million, one hundred ninety-five thousand, five hundred twenty".