157666499 has 4 divisors (see below), whose sum is σ = 158710800. Its totient is φ = 156622200.

The previous prime is 157666493. The next prime is 157666501. The reversal of 157666499 is 994666751.

157666499 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 994666751 = 13 ⋅76512827.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157666499 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 157666499.

It is not an unprimeable number, because it can be changed into a prime (157666493) 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, 521924 + ... + 522225.

It is an arithmetic number, because the mean of its divisors is an integer number (39677700).

Almost surely, 2^157666499 is an apocalyptic number.

157666499 is a deficient number, since it is larger than the sum of its proper divisors (1044301).

157666499 is a wasteful number, since it uses less digits than its factorization.

157666499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1044300.

The product of its digits is 2449440, while the sum is 53.

The square root of 157666499 is about 12556.5321247548. The cubic root of 157666499 is about 540.2313811811.

The spelling of 157666499 in words is "one hundred fifty-seven million, six hundred sixty-six thousand, four hundred ninety-nine".