157398660225 has 27 divisors (see below), whose sum is σ = 281929148553. Its totient is φ = 83942778240.

The previous prime is 157398660193. The next prime is 157398660227. The reversal of 157398660225 is 522066893751.

The square root of 157398660225 is 396735.

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

157398660225 is a `hidden beast` number, since 1 + 5 + 7 + 3 + 9 + 8 + 6 + 602 + 25 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 50791186161 + 106607474064 = 225369^2 + 326508^2 .

It is not a de Polignac number, because 157398660225 - 2⁵ = 157398660193 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (157398660227) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 5937801 + ... + 5964249.

Almost surely, 2^157398660225 is an apocalyptic number.

157398660225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

157398660225 is the 396735-th square number.

157398660225 is the 198368-th centered octagonal number.

It is an amenable number.

157398660225 is a deficient number, since it is larger than the sum of its proper divisors (124530488328).

157398660225 is an frugal number, since it uses more digits than its factorization.

157398660225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52914 (or 26457 counting only the distinct ones).

The product of its (nonzero) digits is 5443200, while the sum is 54.

The spelling of 157398660225 in words is "one hundred fifty-seven billion, three hundred ninety-eight million, six hundred sixty thousand, two hundred twenty-five".