66677724999 has 24 divisors (see below), whose sum is σ = 99738205632. Its totient is φ = 42898115520.

The previous prime is 66677724979. The next prime is 66677725027. The reversal of 66677724999 is 99942777666.

It is not a de Polignac number, because 66677724999 - 2⁷ = 66677724871 is a prime.

It is a super-2 number, since 2×66677724999² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66677724979) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1116687 + ... + 1174880.

It is an arithmetic number, because the mean of its divisors is an integer number (4155758568).

Almost surely, 2^66677724999 is an apocalyptic number.

66677724999 is a deficient number, since it is larger than the sum of its proper divisors (33060480633).

66677724999 is a wasteful number, since it uses less digits than its factorization.

66677724999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2291687 (or 2291684 counting only the distinct ones).

The product of its digits is 432081216, while the sum is 72.

The spelling of 66677724999 in words is "sixty-six billion, six hundred seventy-seven million, seven hundred twenty-four thousand, nine hundred ninety-nine".