649853208551 has 2 divisors, whose sum is σ = 649853208552. Its totient is φ = 649853208550.

The previous prime is 649853208539. The next prime is 649853208577. The reversal of 649853208551 is 155802358946.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 649853208551 - 2²² = 649849014247 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (639853208551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324926604275 + 324926604276.

It is an arithmetic number, because the mean of its divisors is an integer number (324926604276).

Almost surely, 2^649853208551 is an apocalyptic number.

649853208551 is a deficient number, since it is larger than the sum of its proper divisors (1).

649853208551 is an equidigital number, since it uses as much as digits as its factorization.

649853208551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368000, while the sum is 56.

The spelling of 649853208551 in words is "six hundred forty-nine billion, eight hundred fifty-three million, two hundred eight thousand, five hundred fifty-one".