66317734465 has 4 divisors (see below), whose sum is σ = 79581281364. Its totient is φ = 53054187568.

The previous prime is 66317734433. The next prime is 66317734487. The reversal of 66317734465 is 56443771366.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 43501027761 + 22816706704 = 208569^2 + 151052^2 .

It is a cyclic number.

It is not a de Polignac number, because 66317734465 - 2⁵ = 66317734433 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6631773442 + ... + 6631773451.

It is an arithmetic number, because the mean of its divisors is an integer number (19895320341).

Almost surely, 2^66317734465 is an apocalyptic number.

It is an amenable number.

66317734465 is a deficient number, since it is larger than the sum of its proper divisors (13263546899).

66317734465 is a wasteful number, since it uses less digits than its factorization.

66317734465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13263546898.

The product of its digits is 7620480, while the sum is 52.

The spelling of 66317734465 in words is "sixty-six billion, three hundred seventeen million, seven hundred thirty-four thousand, four hundred sixty-five".