157456661 has 2 divisors, whose sum is σ = 157456662. Its totient is φ = 157456660.

The previous prime is 157456639. The next prime is 157456681. The reversal of 157456661 is 166654751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 145684900 + 11771761 = 12070^2 + 3431^2 .

It is an emirp because it is prime and its reverse (166654751) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 157456661 - 2¹⁴ = 157440277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157456681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78728330 + 78728331.

It is an arithmetic number, because the mean of its divisors is an integer number (78728331).

Almost surely, 2^157456661 is an apocalyptic number.

It is an amenable number.

157456661 is a deficient number, since it is larger than the sum of its proper divisors (1).

157456661 is an equidigital number, since it uses as much as digits as its factorization.

157456661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 151200, while the sum is 41.

The square root of 157456661 is about 12548.1736121238. The cubic root of 157456661 is about 539.9916105235.

The spelling of 157456661 in words is "one hundred fifty-seven million, four hundred fifty-six thousand, six hundred sixty-one".