25515023523 has 12 divisors (see below), whose sum is σ = 37393919304. Its totient is φ = 15463650400.

The previous prime is 25515023507. The next prime is 25515023537. The reversal of 25515023523 is 32532051552.

It is not a de Polignac number, because 25515023523 - 2⁴ = 25515023507 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (25515023543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35144298 + ... + 35145023.

It is an arithmetic number, because the mean of its divisors is an integer number (3116159942).

Almost surely, 2^25515023523 is an apocalyptic number.

25515023523 is a deficient number, since it is larger than the sum of its proper divisors (11878895781).

25515023523 is a wasteful number, since it uses less digits than its factorization.

25515023523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70289346 (or 70289335 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 33.

The spelling of 25515023523 in words is "twenty-five billion, five hundred fifteen million, twenty-three thousand, five hundred twenty-three".