66900789 has 8 divisors (see below), whose sum is σ = 99112320. Its totient is φ = 44600508.

The previous prime is 66900751. The next prime is 66900817. The reversal of 66900789 is 98700966.

It is a de Polignac number, because none of the positive numbers 2^k-66900789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66900719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1238877 + ... + 1238930.

It is an arithmetic number, because the mean of its divisors is an integer number (12389040).

Almost surely, 2^66900789 is an apocalyptic number.

It is an amenable number.

66900789 is a deficient number, since it is larger than the sum of its proper divisors (32211531).

66900789 is a wasteful number, since it uses less digits than its factorization.

66900789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2477816 (or 2477810 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 66900789 is about 8179.2902503824. The cubic root of 66900789 is about 405.9542382518.

The spelling of 66900789 in words is "sixty-six million, nine hundred thousand, seven hundred eighty-nine".