66161551011679 has 8 divisors (see below), whose sum is σ = 66376708894368. Its totient is φ = 65946433672800.

The previous prime is 66161551011649. The next prime is 66161551011719. The reversal of 66161551011679 is 97611015516166.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 66161551011679 - 2¹³ = 66161551003487 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 (66161551011649) 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, 6865227 + ... + 13396060.

It is an arithmetic number, because the mean of its divisors is an integer number (8297088611796).

Almost surely, 2^{66161551011679} is an apocalyptic number.

66161551011679 is a deficient number, since it is larger than the sum of its proper divisors (215157882689).

66161551011679 is a wasteful number, since it uses less digits than its factorization.

66161551011679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20271905.

The product of its (nonzero) digits is 2041200, while the sum is 55.

The spelling of 66161551011679 in words is "sixty-six trillion, one hundred sixty-one billion, five hundred fifty-one million, eleven thousand, six hundred seventy-nine".