157452620809 has 9 divisors (see below), whose sum is σ = 173072554599. Its totient is φ = 143134778160.

The previous prime is 157452620789. The next prime is 157452620849. The reversal of 157452620809 is 908026254751.

The square root of 157452620809 is 396803.

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

It can be written as a sum of positive squares in only one way, i.e., 144981985225 + 12470635584 = 380765^2 + 111672^2 .

It is not a de Polignac number, because 157452620809 - 2⁵ = 157452620777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157452620849) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 4346797 + ... + 4382869.

Almost surely, 2^157452620809 is an apocalyptic number.

157452620809 is the 396803-rd square number.

157452620809 is the 198402-nd centered octagonal number.

It is an amenable number.

157452620809 is a deficient number, since it is larger than the sum of its proper divisors (15619933790).

157452620809 is an frugal number, since it uses more digits than its factorization.

157452620809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72168 (or 36084 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 49.

Multiplying 157452620809 by its sum of digits (49), we get a square (7715178419641 = 2777621²).

The spelling of 157452620809 in words is "one hundred fifty-seven billion, four hundred fifty-two million, six hundred twenty thousand, eight hundred nine".