157150008721 has 4 divisors (see below), whose sum is σ = 161397306292. Its totient is φ = 152902711152.

The previous prime is 157150008677. The next prime is 157150008739. The reversal of 157150008721 is 127800051751.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 85989111121 + 71160897600 = 293239^2 + 266760^2 .

It is a cyclic number.

It is not a de Polignac number, because 157150008721 - 2⁷ = 157150008593 is a prime.

It is a super-2 number, since 2×157150008721² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 4247297533 = 157150008721 / (1 + 5 + 7 + 1 + 5 + 0 + 0 + 0 + 8 + 7 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157150008791) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2123648730 + ... + 2123648803.

It is an arithmetic number, because the mean of its divisors is an integer number (40349326573).

Almost surely, 2^157150008721 is an apocalyptic number.

It is an amenable number.

157150008721 is a deficient number, since it is larger than the sum of its proper divisors (4247297571).

157150008721 is an equidigital number, since it uses as much as digits as its factorization.

157150008721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4247297570.

The product of its (nonzero) digits is 19600, while the sum is 37.

The spelling of 157150008721 in words is "one hundred fifty-seven billion, one hundred fifty million, eight thousand, seven hundred twenty-one".