649919506651 has 2 divisors, whose sum is σ = 649919506652. Its totient is φ = 649919506650.

The previous prime is 649919506609. The next prime is 649919506697. The reversal of 649919506651 is 156605919946.

649919506651 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 649919506651 - 2⁹ = 649919506139 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 649919506651.

It is not a weakly prime, because it can be changed into another prime (649919506351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324959753325 + 324959753326.

It is an arithmetic number, because the mean of its divisors is an integer number (324959753326).

Almost surely, 2^649919506651 is an apocalyptic number.

649919506651 is a deficient number, since it is larger than the sum of its proper divisors (1).

649919506651 is an equidigital number, since it uses as much as digits as its factorization.

649919506651 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15746400, while the sum is 61.

The spelling of 649919506651 in words is "six hundred forty-nine billion, nine hundred nineteen million, five hundred six thousand, six hundred fifty-one".