166740387 has 16 divisors (see below), whose sum is σ = 244166400. Its totient is φ = 100373600.

The previous prime is 166740383. The next prime is 166740407. The reversal of 166740387 is 783047661.

It is a cyclic number.

It is not a de Polignac number, because 166740387 - 2² = 166740383 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166740383) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12039 + ... + 21872.

It is an arithmetic number, because the mean of its divisors is an integer number (15260400).

Almost surely, 2^166740387 is an apocalyptic number.

166740387 is a deficient number, since it is larger than the sum of its proper divisors (77426013).

166740387 is a wasteful number, since it uses less digits than its factorization.

166740387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34074.

The product of its (nonzero) digits is 169344, while the sum is 42.

The square root of 166740387 is about 12912.7993479338. The cubic root of 166740387 is about 550.4023359146.

The spelling of 166740387 in words is "one hundred sixty-six million, seven hundred forty thousand, three hundred eighty-seven".