64436426666 has 8 divisors (see below), whose sum is σ = 97740647460. Its totient is φ = 31856210848.

The previous prime is 64436426657. The next prime is 64436426699. The reversal of 64436426666 is 66662463446.

It can be written as a sum of positive squares in 2 ways, for example, as 63241687441 + 1194739225 = 251479^2 + 34565^2 .

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

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, 181001021 + ... + 181001376.

Almost surely, 2^64436426666 is an apocalyptic number.

64436426666 is a deficient number, since it is larger than the sum of its proper divisors (33304220794).

64436426666 is a wasteful number, since it uses less digits than its factorization.

64436426666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362002488.

The product of its digits is 17915904, while the sum is 53.

The spelling of 64436426666 in words is "sixty-four billion, four hundred thirty-six million, four hundred twenty-six thousand, six hundred sixty-six".