66713007387 has 18 divisors (see below), whose sum is σ = 96327769116. Its totient is φ = 41050579440.

The previous prime is 66713007373. The next prime is 66713007409. The reversal of 66713007387 is 78370031766.

It is a happy number.

It is not a de Polignac number, because 66713007387 - 2⁴ = 66713007371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66713017387) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 5810062 + ... + 5821532.

Almost surely, 2^66713007387 is an apocalyptic number.

66713007387 is a deficient number, since it is larger than the sum of its proper divisors (29614761729).

66713007387 is an frugal number, since it uses more digits than its factorization.

66713007387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22971 (or 11487 counting only the distinct ones).

The product of its (nonzero) digits is 889056, while the sum is 48.

Multiplying 66713007387 by its sum of digits (48), we get a square (3202224354576 = 1789476²).

The spelling of 66713007387 in words is "sixty-six billion, seven hundred thirteen million, seven thousand, three hundred eighty-seven".