66768584437 has 4 divisors (see below), whose sum is σ = 70282720480. Its totient is φ = 63254448396.

The previous prime is 66768584429. The next prime is 66768584471. The reversal of 66768584437 is 73448586766.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66768584437 - 2³ = 66768584429 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 (66768584537) 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, 1757067993 + ... + 1757068030.

It is an arithmetic number, because the mean of its divisors is an integer number (17570680120).

Almost surely, 2^66768584437 is an apocalyptic number.

It is an amenable number.

66768584437 is a deficient number, since it is larger than the sum of its proper divisors (3514136043).

66768584437 is a wasteful number, since it uses less digits than its factorization.

66768584437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3514136042.

The product of its digits is 162570240, while the sum is 64.

The spelling of 66768584437 in words is "sixty-six billion, seven hundred sixty-eight million, five hundred eighty-four thousand, four hundred thirty-seven".