66116915 has 8 divisors (see below), whose sum is σ = 79612848. Its totient is φ = 52711840.

The previous prime is 66116909. The next prime is 66116933. The reversal of 66116915 is 51961166.

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

It is not a de Polignac number, because 66116915 - 2⁴ = 66116899 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21101 + ... + 24030.

It is an arithmetic number, because the mean of its divisors is an integer number (9951606).

Almost surely, 2^66116915 is an apocalyptic number.

66116915 is a deficient number, since it is larger than the sum of its proper divisors (13495933).

66116915 is a wasteful number, since it uses less digits than its factorization.

66116915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45429.

The product of its digits is 9720, while the sum is 35.

The square root of 66116915 is about 8131.2308416377. The cubic root of 66116915 is about 404.3624883554.

It can be divided in two parts, 661 and 16915, that added together give a cube (17576 = 26³).

The spelling of 66116915 in words is "sixty-six million, one hundred sixteen thousand, nine hundred fifteen".