649726801799 has 2 divisors, whose sum is σ = 649726801800. Its totient is φ = 649726801798.

The previous prime is 649726801793. The next prime is 649726801817. The reversal of 649726801799 is 997108627946.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 649726801799 - 2⁴ = 649726801783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (649726801793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324863400899 + 324863400900.

It is an arithmetic number, because the mean of its divisors is an integer number (324863400900).

Almost surely, 2^649726801799 is an apocalyptic number.

649726801799 is a deficient number, since it is larger than the sum of its proper divisors (1).

649726801799 is an equidigital number, since it uses as much as digits as its factorization.

649726801799 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82301184, while the sum is 68.

The spelling of 649726801799 in words is "six hundred forty-nine billion, seven hundred twenty-six million, eight hundred one thousand, seven hundred ninety-nine".