66402994 has 16 divisors (see below), whose sum is σ = 114251328. Its totient is φ = 28354032.

The previous prime is 66402991. The next prime is 66403009. The reversal of 66402994 is 49920466.

It is a super-2 number, since 2×66402994² = 8818715224328072, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66402991) 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, 4684 + ... + 12439.

It is an arithmetic number, because the mean of its divisors is an integer number (7140708).

Almost surely, 2^66402994 is an apocalyptic number.

66402994 is a deficient number, since it is larger than the sum of its proper divisors (47848334).

66402994 is a wasteful number, since it uses less digits than its factorization.

66402994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17409.

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 66402994 is about 8148.8032250141. The cubic root of 66402994 is about 404.9448565881.

The spelling of 66402994 in words is "sixty-six million, four hundred two thousand, nine hundred ninety-four".