66256407 has 16 divisors (see below), whose sum is σ = 112180480. Its totient is φ = 37860696.

The previous prime is 66256397. The next prime is 66256423. The reversal of 66256407 is 70465266.

66256407 is a `hidden beast` number, since 6 + 6 + 2 + 5 + 640 + 7 = 666.

It is not a de Polignac number, because 66256407 - 2⁴ = 66256391 is a prime.

It is a super-2 number, since 2×66256407² = 8779822937099298, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66256427) 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, 175093 + ... + 175470.

It is an arithmetic number, because the mean of its divisors is an integer number (7011280).

Almost surely, 2^66256407 is an apocalyptic number.

66256407 is a deficient number, since it is larger than the sum of its proper divisors (45924073).

66256407 is a wasteful number, since it uses less digits than its factorization.

66256407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350579 (or 350573 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The square root of 66256407 is about 8139.8038674160. The cubic root of 66256407 is about 404.6466602705.

The spelling of 66256407 in words is "sixty-six million, two hundred fifty-six thousand, four hundred seven".