66774370734 has 16 divisors (see below), whose sum is σ = 148387490640. Its totient is φ = 22258123560.

The previous prime is 66774370723. The next prime is 66774370757. The reversal of 66774370734 is 43707347766.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 1236562421 = 66774370734 / (6 + 6 + 7 + 7 + 4 + 3 + 7 + 0 + 7 + 3 + 4).

It is a congruent 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, 618281157 + ... + 618281264.

It is an arithmetic number, because the mean of its divisors is an integer number (9274218165).

Almost surely, 2^66774370734 is an apocalyptic number.

66774370734 is an abundant number, since it is smaller than the sum of its proper divisors (81613119906).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66774370734 is a wasteful number, since it uses less digits than its factorization.

66774370734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1236562432 (or 1236562426 counting only the distinct ones).

The product of its (nonzero) digits is 12446784, while the sum is 54.

The spelling of 66774370734 in words is "sixty-six billion, seven hundred seventy-four million, three hundred seventy thousand, seven hundred thirty-four".