66516220717163 has 32 divisors (see below), whose sum is σ = 78735260313600. Its totient is φ = 56157554154240.

The previous prime is 66516220717157. The next prime is 66516220717169. The reversal of 66516220717163 is 36171702261566.

It is an interprime number because it is at equal distance from previous prime (66516220717157) and next prime (66516220717169).

It is not a de Polignac number, because 66516220717163 - 2¹² = 66516220713067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66516220717169) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 248773595 + ... + 249040827.

It is an arithmetic number, because the mean of its divisors is an integer number (2460476884800).

Almost surely, 2^{66516220717163} is an apocalyptic number.

66516220717163 is a deficient number, since it is larger than the sum of its proper divisors (12219039596437).

66516220717163 is a wasteful number, since it uses less digits than its factorization.

66516220717163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278152 (or 278138 counting only the distinct ones).

The product of its (nonzero) digits is 3810240, while the sum is 53.

The spelling of 66516220717163 in words is "sixty-six trillion, five hundred sixteen billion, two hundred twenty million, seven hundred seventeen thousand, one hundred sixty-three".