18341978525 has 12 divisors (see below), whose sum is σ = 24493596372. Its totient is φ = 13544845440.

The previous prime is 18341978509. The next prime is 18341978549. The reversal of 18341978525 is 52587914381.

It can be written as a sum of positive squares in 6 ways, for example, as 139381636 + 18202596889 = 11806^2 + 134917^2 .

It is not a de Polignac number, because 18341978525 - 2⁴ = 18341978509 is a prime.

It is a super-2 number, since 2×18341978525² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (53) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28218104 + ... + 28218753.

It is an arithmetic number, because the mean of its divisors is an integer number (2041133031).

Almost surely, 2^18341978525 is an apocalyptic number.

It is an amenable number.

18341978525 is a deficient number, since it is larger than the sum of its proper divisors (6151617847).

18341978525 is a wasteful number, since it uses less digits than its factorization.

18341978525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56436880 (or 56436875 counting only the distinct ones).

The product of its digits is 2419200, while the sum is 53.

The spelling of 18341978525 in words is "eighteen billion, three hundred forty-one million, nine hundred seventy-eight thousand, five hundred twenty-five".