649426124261 has 2 divisors, whose sum is σ = 649426124262. Its totient is φ = 649426124260.

The previous prime is 649426124231. The next prime is 649426124287. The reversal of 649426124261 is 162421624946.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 624604121761 + 24822002500 = 790319^2 + 157550^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-649426124261 is a prime.

It is a super-2 number, since 2×649426124261² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (649426124231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324713062130 + 324713062131.

It is an arithmetic number, because the mean of its divisors is an integer number (324713062131).

Almost surely, 2^649426124261 is an apocalyptic number.

It is an amenable number.

649426124261 is a deficient number, since it is larger than the sum of its proper divisors (1).

649426124261 is an equidigital number, since it uses as much as digits as its factorization.

649426124261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 995328, while the sum is 47.

The spelling of 649426124261 in words is "six hundred forty-nine billion, four hundred twenty-six million, one hundred twenty-four thousand, two hundred sixty-one".