66994467 has 16 divisors (see below), whose sum is σ = 95172480. Its totient is φ = 41772672.

The previous prime is 66994453. The next prime is 66994481. The reversal of 66994467 is 76449966.

It is an interprime number because it is at equal distance from previous prime (66994453) and next prime (66994481).

It is not a de Polignac number, because 66994467 - 2⁷ = 66994339 is a prime.

It is a super-2 number, since 2×66994467² = 8976517217228178, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (66994427) 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, 4284 + ... + 12342.

It is an arithmetic number, because the mean of its divisors is an integer number (5948280).

Almost surely, 2^66994467 is an apocalyptic number.

66994467 is a deficient number, since it is larger than the sum of its proper divisors (28178013).

66994467 is a wasteful number, since it uses less digits than its factorization.

66994467 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8242.

The product of its digits is 1959552, while the sum is 51.

The square root of 66994467 is about 8185.0147831265. The cubic root of 66994467 is about 406.1436293658.

The spelling of 66994467 in words is "sixty-six million, nine hundred ninety-four thousand, four hundred sixty-seven".