648631742377 has 2 divisors, whose sum is σ = 648631742378. Its totient is φ = 648631742376.

The previous prime is 648631742293. The next prime is 648631742387. The reversal of 648631742377 is 773247136846.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 629413742736 + 19217999641 = 793356^2 + 138629^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-648631742377 is a prime.

It is a super-2 number, since 2×648631742377² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (648631742387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324315871188 + 324315871189.

It is an arithmetic number, because the mean of its divisors is an integer number (324315871189).

Almost surely, 2^648631742377 is an apocalyptic number.

It is an amenable number.

648631742377 is a deficient number, since it is larger than the sum of its proper divisors (1).

648631742377 is an equidigital number, since it uses as much as digits as its factorization.

648631742377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28449792, while the sum is 58.

The spelling of 648631742377 in words is "six hundred forty-eight billion, six hundred thirty-one million, seven hundred forty-two thousand, three hundred seventy-seven".