648258336631 has 4 divisors (see below), whose sum is σ = 648262404000. Its totient is φ = 648254269264.

The previous prime is 648258336623. The next prime is 648258336707. The reversal of 648258336631 is 136633852846.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 648258336631 - 2³ = 648258336623 is a prime.

It is a super-2 number, since 2×648258336631² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648258036631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1784431 + ... + 2116768.

It is an arithmetic number, because the mean of its divisors is an integer number (162065601000).

Almost surely, 2^648258336631 is an apocalyptic number.

648258336631 is a deficient number, since it is larger than the sum of its proper divisors (4067369).

648258336631 is a wasteful number, since it uses less digits than its factorization.

648258336631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4067368.

The product of its digits is 14929920, while the sum is 55.

The spelling of 648258336631 in words is "six hundred forty-eight billion, two hundred fifty-eight million, three hundred thirty-six thousand, six hundred thirty-one".