66461679 has 12 divisors (see below), whose sum is σ = 96072600. Its totient is φ = 44274384.

The previous prime is 66461663. The next prime is 66461683. The reversal of 66461679 is 97616466.

It is a happy number.

It is not a de Polignac number, because 66461679 - 2⁴ = 66461663 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66466679) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17917 + ... + 21305.

It is an arithmetic number, because the mean of its divisors is an integer number (8006050).

Almost surely, 2^66461679 is an apocalyptic number.

66461679 is the 4358-th nonagonal number.

66461679 is a deficient number, since it is larger than the sum of its proper divisors (29610921).

66461679 is a wasteful number, since it uses less digits than its factorization.

66461679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5574 (or 5571 counting only the distinct ones).

The product of its digits is 326592, while the sum is 45.

The square root of 66461679 is about 8152.4032652955. The cubic root of 66461679 is about 405.0641142210.

The spelling of 66461679 in words is "sixty-six million, four hundred sixty-one thousand, six hundred seventy-nine".