66415746 has 8 divisors (see below), whose sum is σ = 132831504. Its totient is φ = 22138580.

The previous prime is 66415709. The next prime is 66415759. The reversal of 66415746 is 64751466.

It is a sphenic number, since it is the product of 3 distinct primes.

66415746 is an admirable number.

It is a super-2 number, since 2×66415746² = 8822102633473032, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5534640 + ... + 5534651.

It is an arithmetic number, because the mean of its divisors is an integer number (16603938).

Almost surely, 2^66415746 is an apocalyptic number.

66415746 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66415746 is a wasteful number, since it uses less digits than its factorization.

66415746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11069296.

The product of its digits is 120960, while the sum is 39.

The square root of 66415746 is about 8149.5856336381. The cubic root of 66415746 is about 404.9707767361.

It can be divided in two parts, 66415 and 746, that added together give a triangular number (67161 = T₃₆₆).

The spelling of 66415746 in words is "sixty-six million, four hundred fifteen thousand, seven hundred forty-six".