66831933214997 has 32 divisors (see below), whose sum is σ = 73569567375360. Its totient is φ = 60506089997760.

The previous prime is 66831933214979. The next prime is 66831933215077. The reversal of 66831933214997 is 79941233913866.

It is not a de Polignac number, because 66831933214997 - 2¹² = 66831933210901 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66831933214997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66831933217997) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48005204 + ... + 49377762.

It is an arithmetic number, because the mean of its divisors is an integer number (2299048980480).

Almost surely, 2^{66831933214997} is an apocalyptic number.

It is an amenable number.

66831933214997 is a deficient number, since it is larger than the sum of its proper divisors (6737634160363).

66831933214997 is a wasteful number, since it uses less digits than its factorization.

66831933214997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1374113.

The product of its digits is 317447424, while the sum is 71.

The spelling of 66831933214997 in words is "sixty-six trillion, eight hundred thirty-one billion, nine hundred thirty-three million, two hundred fourteen thousand, nine hundred ninety-seven".