158081784025 has 27 divisors (see below), whose sum is σ = 215491361533. Its totient is φ = 114952666400.

The previous prime is 158081784017. The next prime is 158081784053. The reversal of 158081784025 is 520487180851.

It is a happy number.

The square root of 158081784025 is 397595.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 49877628889 + 108204155136 = 223333^2 + 328944^2 .

It is not a de Polignac number, because 158081784025 - 2³ = 158081784017 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 158081784025.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 21864111 + ... + 21871339.

Almost surely, 2^158081784025 is an apocalyptic number.

158081784025 is the 397595-th square number.

158081784025 is the 198798-th centered octagonal number.

It is an amenable number.

158081784025 is a deficient number, since it is larger than the sum of its proper divisors (57409577508).

158081784025 is an frugal number, since it uses more digits than its factorization.

158081784025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14490 (or 7245 counting only the distinct ones).

The product of its (nonzero) digits is 716800, while the sum is 49.

Multiplying 158081784025 by its sum of digits (49), we get a square (7746007417225 = 2783165²).

The spelling of 158081784025 in words is "one hundred fifty-eight billion, eighty-one million, seven hundred eighty-four thousand, twenty-five".