64900783666 has 8 divisors (see below), whose sum is σ = 97702624620. Its totient is φ = 32333242128.

The previous prime is 64900783657. The next prime is 64900783723. The reversal of 64900783666 is 66638700946.

It can be written as a sum of positive squares in 2 ways, for example, as 62239771441 + 2661012225 = 249479^2 + 51585^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×64900783666² (a number of 22 digits) contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 58574161 + ... + 58575268.

Almost surely, 2^64900783666 is an apocalyptic number.

64900783666 is a deficient number, since it is larger than the sum of its proper divisors (32801840954).

64900783666 is a wasteful number, since it uses less digits than its factorization.

64900783666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117149708.

The product of its (nonzero) digits is 7838208, while the sum is 55.

The spelling of 64900783666 in words is "sixty-four billion, nine hundred million, seven hundred eighty-three thousand, six hundred sixty-six".