648941958943 has 4 divisors (see below), whose sum is σ = 652236080760. Its totient is φ = 645647837128.

The previous prime is 648941958911. The next prime is 648941958967. The reversal of 648941958943 is 349859149846.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 349859149846 = 2 ⋅174929574923.

It is a cyclic number.

It is not a de Polignac number, because 648941958943 - 2⁵ = 648941958911 is a prime.

It is a super-2 number, since 2×648941958943² (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 (648941952943) 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, 1647060613 + ... + 1647061006.

It is an arithmetic number, because the mean of its divisors is an integer number (163059020190).

Almost surely, 2^648941958943 is an apocalyptic number.

648941958943 is a deficient number, since it is larger than the sum of its proper divisors (3294121817).

648941958943 is a wasteful number, since it uses less digits than its factorization.

648941958943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3294121816.

The product of its digits is 268738560, while the sum is 70.

The spelling of 648941958943 in words is "six hundred forty-eight billion, nine hundred forty-one million, nine hundred fifty-eight thousand, nine hundred forty-three".