640308848896 has 18 divisors (see below), whose sum is σ = 1278116491862. Its totient is φ = 320154424320.

The previous prime is 640308848819. The next prime is 640308848899. The reversal of 640308848896 is 698848803046.

It can be written as a sum of positive squares in only one way, i.e., 620212951296 + 20095897600 = 787536^2 + 141760^2 .

It is a Harshad number since it is a multiple of its sum of digits (64).

It is not an unprimeable number, because it can be changed into a prime (640308848899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1250602965 + ... + 1250603476.

Almost surely, 2^640308848896 is an apocalyptic number.

It is an amenable number.

640308848896 is a deficient number, since it is larger than the sum of its proper divisors (637807642966).

640308848896 is an equidigital number, since it uses as much as digits as its factorization.

640308848896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2501206457 (or 2501206443 counting only the distinct ones).

The product of its (nonzero) digits is 63700992, while the sum is 64.

The spelling of 640308848896 in words is "six hundred forty billion, three hundred eight million, eight hundred forty-eight thousand, eight hundred ninety-six".