18725020725 has 24 divisors (see below), whose sum is σ = 30985061472. Its totient is φ = 9978174400.

The previous prime is 18725020723. The next prime is 18725020739. The reversal of 18725020725 is 52702052781.

It is not a de Polignac number, because 18725020725 - 2¹ = 18725020723 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18725020723) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17127 + ... + 194276.

It is an arithmetic number, because the mean of its divisors is an integer number (1291044228).

Almost surely, 2^18725020725 is an apocalyptic number.

18725020725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18725020725 is a deficient number, since it is larger than the sum of its proper divisors (12260040747).

18725020725 is a wasteful number, since it uses less digits than its factorization.

18725020725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212597 (or 212592 counting only the distinct ones).

The product of its (nonzero) digits is 78400, while the sum is 39.

The spelling of 18725020725 in words is "eighteen billion, seven hundred twenty-five million, twenty thousand, seven hundred twenty-five".