66951162823 has 4 divisors (see below), whose sum is σ = 69259823640. Its totient is φ = 64642502008.

The previous prime is 66951162797. The next prime is 66951162851. The reversal of 66951162823 is 32826115966.

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-66951162823 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 (66951163823) 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, 1154330365 + ... + 1154330422.

It is an arithmetic number, because the mean of its divisors is an integer number (17314955910).

Almost surely, 2^66951162823 is an apocalyptic number.

66951162823 is a deficient number, since it is larger than the sum of its proper divisors (2308660817).

66951162823 is a wasteful number, since it uses less digits than its factorization.

66951162823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2308660816.

The product of its digits is 933120, while the sum is 49.

The spelling of 66951162823 in words is "sixty-six billion, nine hundred fifty-one million, one hundred sixty-two thousand, eight hundred twenty-three".