666616650515 has 8 divisors (see below), whose sum is σ = 799957022208. Its totient is φ = 533281959360.

The previous prime is 666616650493. The next prime is 666616650521. The reversal of 666616650515 is 515056616666.

It is a happy number.

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

It is not a de Polignac number, because 666616650515 - 2¹⁶ = 666616584979 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, 1157546 + ... + 1634975.

It is an arithmetic number, because the mean of its divisors is an integer number (99994627776).

Almost surely, 2^666616650515 is an apocalyptic number.

666616650515 is a deficient number, since it is larger than the sum of its proper divisors (133340371693).

666616650515 is a wasteful number, since it uses less digits than its factorization.

666616650515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2840269.

The product of its (nonzero) digits is 5832000, while the sum is 53.

It can be divided in two parts, 666616 and 650515, that added together give a palindrome (1317131).

The spelling of 666616650515 in words is "six hundred sixty-six billion, six hundred sixteen million, six hundred fifty thousand, five hundred fifteen".