157666 has 8 divisors (see below), whose sum is σ = 244224. Its totient is φ = 76260.

The previous prime is 157649. The next prime is 157667. The reversal of 157666 is 666751.

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

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a plaindrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (157667) 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, 1210 + ... + 1333.

It is an arithmetic number, because the mean of its divisors is an integer number (30528).

2¹⁵⁷⁶⁶⁶ is an apocalyptic number.

157666 is a deficient number, since it is larger than the sum of its proper divisors (86558).

157666 is a wasteful number, since it uses less digits than its factorization.

157666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2576.

The product of its digits is 7560, while the sum is 31.

The square root of 157666 is about 397.0717819236. The cubic root of 157666 is about 54.0230811253.

The spelling of 157666 in words is "one hundred fifty-seven thousand, six hundred sixty-six".