64946947988 has 12 divisors (see below), whose sum is σ = 122400017460. Its totient is φ = 29975514432.

The previous prime is 64946947943. The next prime is 64946948039. The reversal of 64946947988 is 88974964946.

It can be written as a sum of positive squares in 2 ways, for example, as 38332940944 + 26614007044 = 195788^2 + 163138^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 624489833 + ... + 624489936.

It is an arithmetic number, because the mean of its divisors is an integer number (10200001455).

Almost surely, 2^64946947988 is an apocalyptic number.

It is an amenable number.

64946947988 is a deficient number, since it is larger than the sum of its proper divisors (57453069472).

64946947988 is a wasteful number, since it uses less digits than its factorization.

64946947988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1248979786 (or 1248979784 counting only the distinct ones).

The product of its digits is 752467968, while the sum is 74.

The spelling of 64946947988 in words is "sixty-four billion, nine hundred forty-six million, nine hundred forty-seven thousand, nine hundred eighty-eight".