66358776604 has 24 divisors (see below), whose sum is σ = 121078218240. Its totient is φ = 31783018176.

The previous prime is 66358776581. The next prime is 66358776697. The reversal of 66358776604 is 40667785366.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (58).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2237467 + ... + 2266930.

It is an arithmetic number, because the mean of its divisors is an integer number (5044925760).

Almost surely, 2^66358776604 is an apocalyptic number.

It is an amenable number.

66358776604 is a deficient number, since it is larger than the sum of its proper divisors (54719441636).

66358776604 is a wasteful number, since it uses less digits than its factorization.

66358776604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4504557 (or 4504555 counting only the distinct ones).

The product of its (nonzero) digits is 30481920, while the sum is 58.

The spelling of 66358776604 in words is "sixty-six billion, three hundred fifty-eight million, seven hundred seventy-six thousand, six hundred four".