157661887 has 2 divisors, whose sum is σ = 157661888. Its totient is φ = 157661886.

The previous prime is 157661873. The next prime is 157661897. The reversal of 157661887 is 788166751.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 157661887 - 2²³ = 149273279 is a prime.

It is a super-2 number, since 2×157661887² = 49714541224801538, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 157661887.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157661827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78830943 + 78830944.

It is an arithmetic number, because the mean of its divisors is an integer number (78830944).

Almost surely, 2^157661887 is an apocalyptic number.

157661887 is a deficient number, since it is larger than the sum of its proper divisors (1).

157661887 is an equidigital number, since it uses as much as digits as its factorization.

157661887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 564480, while the sum is 49.

The square root of 157661887 is about 12556.3484739792. The cubic root of 157661887 is about 540.2261135827.

The spelling of 157661887 in words is "one hundred fifty-seven million, six hundred sixty-one thousand, eight hundred eighty-seven".