66513102774079 has 16 divisors (see below), whose sum is σ = 71705191209120. Its totient is φ = 61331846653440.

The previous prime is 66513102774031. The next prime is 66513102774089. The reversal of 66513102774079 is 97047720131566.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 66513102774079 - 2²¹ = 66513100676927 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 (66513102774089) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86166024 + ... + 86934514.

It is an arithmetic number, because the mean of its divisors is an integer number (4481574450570).

Almost surely, 2^{66513102774079} is an apocalyptic number.

66513102774079 is a deficient number, since it is larger than the sum of its proper divisors (5192088435041).

66513102774079 is a wasteful number, since it uses less digits than its factorization.

66513102774079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 775530.

The product of its (nonzero) digits is 13335840, while the sum is 58.

The spelling of 66513102774079 in words is "sixty-six trillion, five hundred thirteen billion, one hundred two million, seven hundred seventy-four thousand, seventy-nine".