648400256715 has 8 divisors (see below), whose sum is σ = 1037440410768. Its totient is φ = 345813470240.

The previous prime is 648400256711. The next prime is 648400256717. The reversal of 648400256715 is 517652004846.

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

It is not a de Polignac number, because 648400256715 - 2² = 648400256711 is a prime.

It is not an unprimeable number, because it can be changed into a prime (648400256711) 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, 21613341876 + ... + 21613341905.

It is an arithmetic number, because the mean of its divisors is an integer number (129680051346).

Almost surely, 2^648400256715 is an apocalyptic number.

648400256715 is a deficient number, since it is larger than the sum of its proper divisors (389040154053).

648400256715 is a wasteful number, since it uses less digits than its factorization.

648400256715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43226683789.

The product of its (nonzero) digits is 1612800, while the sum is 48.

The spelling of 648400256715 in words is "six hundred forty-eight billion, four hundred million, two hundred fifty-six thousand, seven hundred fifteen".