157872862691 has 2 divisors, whose sum is σ = 157872862692. Its totient is φ = 157872862690.

The previous prime is 157872862657. The next prime is 157872862709. The reversal of 157872862691 is 196268278751.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157872862691 is a prime.

It is a super-2 number, since 2×157872862691² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (157872862601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78936431345 + 78936431346.

It is an arithmetic number, because the mean of its divisors is an integer number (78936431346).

Almost surely, 2^157872862691 is an apocalyptic number.

157872862691 is a deficient number, since it is larger than the sum of its proper divisors (1).

157872862691 is an equidigital number, since it uses as much as digits as its factorization.

157872862691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20321280, while the sum is 62.

The spelling of 157872862691 in words is "one hundred fifty-seven billion, eight hundred seventy-two million, eight hundred sixty-two thousand, six hundred ninety-one".