64691601317988 has 24 divisors (see below), whose sum is σ = 150992385677280. Its totient is φ = 21557393400960.

The previous prime is 64691601317983. The next prime is 64691601318103. The reversal of 64691601317988 is 88971310619646.

It is not an unprimeable number, because it can be changed into a prime (64691601317983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 809171493 + ... + 809251436.

It is an arithmetic number, because the mean of its divisors is an integer number (6291349403220).

Almost surely, 2^{64691601317988} is an apocalyptic number.

It is an amenable number.

64691601317988 is an abundant number, since it is smaller than the sum of its proper divisors (86300784359292).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64691601317988 is a wasteful number, since it uses less digits than its factorization.

64691601317988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1618426267 (or 1618426265 counting only the distinct ones).

The product of its (nonzero) digits is 94058496, while the sum is 69.

The spelling of 64691601317988 in words is "sixty-four trillion, six hundred ninety-one billion, six hundred one million, three hundred seventeen thousand, nine hundred eighty-eight".