66791493 has 8 divisors (see below), whose sum is σ = 98950400. Its totient is φ = 44527644.

The previous prime is 66791477. The next prime is 66791503. The reversal of 66791493 is 39419766.

It is not a de Polignac number, because 66791493 - 2⁴ = 66791477 is a prime.

It is a super-2 number, since 2×66791493² = 8922207074338098, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66791093) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1236853 + ... + 1236906.

It is an arithmetic number, because the mean of its divisors is an integer number (12368800).

Almost surely, 2^66791493 is an apocalyptic number.

It is an amenable number.

66791493 is a deficient number, since it is larger than the sum of its proper divisors (32158907).

66791493 is a wasteful number, since it uses less digits than its factorization.

66791493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2473768 (or 2473762 counting only the distinct ones).

The product of its digits is 244944, while the sum is 45.

The square root of 66791493 is about 8172.6062550450. The cubic root of 66791493 is about 405.7330482427.

The spelling of 66791493 in words is "sixty-six million, seven hundred ninety-one thousand, four hundred ninety-three".