66788974390 has 16 divisors (see below), whose sum is σ = 120745136880. Its totient is φ = 26598926880.

The previous prime is 66788974381. The next prime is 66788974393. The reversal of 66788974390 is 9347988766.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66788974393) 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, 14580456 + ... + 14585035.

It is an arithmetic number, because the mean of its divisors is an integer number (7546571055).

Almost surely, 2^66788974390 is an apocalyptic number.

66788974390 is a deficient number, since it is larger than the sum of its proper divisors (53956162490).

66788974390 is a wasteful number, since it uses less digits than its factorization.

66788974390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29165727.

The product of its (nonzero) digits is 109734912, while the sum is 67.

The spelling of 66788974390 in words is "sixty-six billion, seven hundred eighty-eight million, nine hundred seventy-four thousand, three hundred ninety".