66964090493 has 6 divisors (see below), whose sum is σ = 67780614174. Its totient is φ = 66157287416.

The previous prime is 66964090429. The next prime is 66964090507. The reversal of 66964090493 is 39409046966.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 59992174489 + 6971916004 = 244933^2 + 83498^2 .

It is not a de Polignac number, because 66964090493 - 2⁶ = 66964090429 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 (66964098493) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4853330 + ... + 4867107.

It is an arithmetic number, because the mean of its divisors is an integer number (11296769029).

Almost surely, 2^66964090493 is an apocalyptic number.

It is an amenable number.

66964090493 is a deficient number, since it is larger than the sum of its proper divisors (816523681).

66964090493 is an frugal number, since it uses more digits than its factorization.

66964090493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9720603 (or 9720520 counting only the distinct ones).

The product of its (nonzero) digits is 7558272, while the sum is 56.

The spelling of 66964090493 in words is "sixty-six billion, nine hundred sixty-four million, ninety thousand, four hundred ninety-three".