66158667 has 16 divisors (see below), whose sum is σ = 98388000. Its totient is φ = 43936992.

The previous prime is 66158641. The next prime is 66158671. The reversal of 66158667 is 76685166.

66158667 is a `hidden beast` number, since 6 + 6 + 1 + 586 + 67 = 666.

It is not a de Polignac number, because 66158667 - 2⁷ = 66158539 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (66158167) 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, 2709 + ... + 11817.

It is an arithmetic number, because the mean of its divisors is an integer number (6149250).

Almost surely, 2^66158667 is an apocalyptic number.

66158667 is a deficient number, since it is larger than the sum of its proper divisors (32229333).

66158667 is a wasteful number, since it uses less digits than its factorization.

66158667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9387 (or 9381 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 66158667 is about 8133.7978214362. The cubic root of 66158667 is about 404.4475870530.

The spelling of 66158667 in words is "sixty-six million, one hundred fifty-eight thousand, six hundred sixty-seven".