252403121865 has 32 divisors (see below), whose sum is σ = 425512010880. Its totient is φ = 127406393856.

The previous prime is 252403121863. The next prime is 252403121879. The reversal of 252403121865 is 568121304252.

It is not a de Polignac number, because 252403121865 - 2¹ = 252403121863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (252403121863) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 134262 + ... + 723071.

It is an arithmetic number, because the mean of its divisors is an integer number (13297250340).

Almost surely, 2^252403121865 is an apocalyptic number.

It is an amenable number.

252403121865 is a deficient number, since it is larger than the sum of its proper divisors (173108889015).

252403121865 is a wasteful number, since it uses less digits than its factorization.

252403121865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 858393.

The product of its (nonzero) digits is 115200, while the sum is 39.

It can be divided in two parts, 2524031 and 21865, that added together give a triangular number (2545896 = T₂₂₅₆).

The spelling of 252403121865 in words is "two hundred fifty-two billion, four hundred three million, one hundred twenty-one thousand, eight hundred sixty-five".