66937464487 has 4 divisors (see below), whose sum is σ = 70874962416. Its totient is φ = 62999966560.

The previous prime is 66937464481. The next prime is 66937464533. The reversal of 66937464487 is 78446473966.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66937464487 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 (66937464481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1968748939 + ... + 1968748972.

It is an arithmetic number, because the mean of its divisors is an integer number (17718740604).

Almost surely, 2^66937464487 is an apocalyptic number.

66937464487 is a deficient number, since it is larger than the sum of its proper divisors (3937497929).

66937464487 is a wasteful number, since it uses less digits than its factorization.

66937464487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3937497928.

The product of its digits is 146313216, while the sum is 64.

The spelling of 66937464487 in words is "sixty-six billion, nine hundred thirty-seven million, four hundred sixty-four thousand, four hundred eighty-seven".