66905379 has 16 divisors (see below), whose sum is σ = 100000800. Its totient is φ = 44206848.

The previous prime is 66905341. The next prime is 66905381. The reversal of 66905379 is 97350966.

It is not a de Polignac number, because 66905379 - 2¹² = 66901283 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66903379) 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, 7914 + ... + 14015.

It is an arithmetic number, because the mean of its divisors is an integer number (6250050).

Almost surely, 2^66905379 is an apocalyptic number.

66905379 is a deficient number, since it is larger than the sum of its proper divisors (33095421).

66905379 is a wasteful number, since it uses less digits than its factorization.

66905379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22051 (or 22045 counting only the distinct ones).

The product of its (nonzero) digits is 306180, while the sum is 45.

The square root of 66905379 is about 8179.5708322625. The cubic root of 66905379 is about 405.9635220852.

The spelling of 66905379 in words is "sixty-six million, nine hundred five thousand, three hundred seventy-nine".