157666961 has 8 divisors (see below), whose sum is σ = 164277504. Its totient is φ = 151151760.

The previous prime is 157666937. The next prime is 157666963. The reversal of 157666961 is 169666751.

It is a happy number.

157666961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157666961 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (157666963) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20450 + ... + 27083.

It is an arithmetic number, because the mean of its divisors is an integer number (20534688).

Almost surely, 2^157666961 is an apocalyptic number.

It is an amenable number.

157666961 is a deficient number, since it is larger than the sum of its proper divisors (6610543).

157666961 is a wasteful number, since it uses less digits than its factorization.

157666961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47671.

The product of its digits is 408240, while the sum is 47.

The square root of 157666961 is about 12556.5505215405. The cubic root of 157666961 is about 540.2319088491.

The spelling of 157666961 in words is "one hundred fifty-seven million, six hundred sixty-six thousand, nine hundred sixty-one".