66515457 has 8 divisors (see below), whose sum is σ = 88730176. Its totient is φ = 44322192.

The previous prime is 66515431. The next prime is 66515467. The reversal of 66515457 is 75451566.

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

It is not a de Polignac number, because 66515457 - 2⁷ = 66515329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66515467) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4428 + ... + 12354.

It is an arithmetic number, because the mean of its divisors is an integer number (11091272).

Almost surely, 2^66515457 is an apocalyptic number.

It is an amenable number.

66515457 is a deficient number, since it is larger than the sum of its proper divisors (22214719).

66515457 is a wasteful number, since it uses less digits than its factorization.

66515457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10727.

The product of its digits is 126000, while the sum is 39.

The square root of 66515457 is about 8155.7008895619. The cubic root of 66515457 is about 405.1733383908.

The spelling of 66515457 in words is "sixty-six million, five hundred fifteen thousand, four hundred fifty-seven".