252861495805840 has 80 divisors (see below), whose sum is σ = 602246675995776. Its totient is φ = 98676902988800.

The previous prime is 252861495805783. The next prime is 252861495805979. The reversal of 252861495805840 is 48508594168252.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×252861495805840² (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 15 ways as a sum of consecutive naturals, for example, 643769349 + ... + 644162011.

Almost surely, 2^{252861495805840} is an apocalyptic number.

252861495805840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

252861495805840 is an abundant number, since it is smaller than the sum of its proper divisors (349385180189936).

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

252861495805840 is a wasteful number, since it uses less digits than its factorization.

252861495805840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 589048 (or 589042 counting only the distinct ones).

The product of its (nonzero) digits is 221184000, while the sum is 67.

The spelling of 252861495805840 in words is "two hundred fifty-two trillion, eight hundred sixty-one billion, four hundred ninety-five million, eight hundred five thousand, eight hundred forty".