649767843623 has 2 divisors, whose sum is σ = 649767843624. Its totient is φ = 649767843622.

The previous prime is 649767843563. The next prime is 649767843689. The reversal of 649767843623 is 326348767946.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 649767843623 - 2⁶ = 649767843559 is a prime.

It is a super-2 number, since 2×649767843623² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 649767843623.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (649767843323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324883921811 + 324883921812.

It is an arithmetic number, because the mean of its divisors is an integer number (324883921812).

Almost surely, 2^649767843623 is an apocalyptic number.

649767843623 is a deficient number, since it is larger than the sum of its proper divisors (1).

649767843623 is an equidigital number, since it uses as much as digits as its factorization.

649767843623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 219469824, while the sum is 65.

The spelling of 649767843623 in words is "six hundred forty-nine billion, seven hundred sixty-seven million, eight hundred forty-three thousand, six hundred twenty-three".