66170016176551 has 32 divisors (see below), whose sum is σ = 77728665600000. Its totient is φ = 56304181122336.

The previous prime is 66170016176533. The next prime is 66170016176569. The reversal of 66170016176551 is 15567161007166.

It is an interprime number because it is at equal distance from previous prime (66170016176533) and next prime (66170016176569).

It is not a de Polignac number, because 66170016176551 - 2⁵ = 66170016176519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66170016176521) 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, 88913370 + ... + 89654488.

It is an arithmetic number, because the mean of its divisors is an integer number (2429020800000).

Almost surely, 2^{66170016176551} is an apocalyptic number.

66170016176551 is a deficient number, since it is larger than the sum of its proper divisors (11558649423449).

66170016176551 is a wasteful number, since it uses less digits than its factorization.

66170016176551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 743036 (or 743022 counting only the distinct ones).

The product of its (nonzero) digits is 1587600, while the sum is 52.

The spelling of 66170016176551 in words is "sixty-six trillion, one hundred seventy billion, sixteen million, one hundred seventy-six thousand, five hundred fifty-one".