648974011381 has 2 divisors, whose sum is σ = 648974011382. Its totient is φ = 648974011380.

The previous prime is 648974011373. The next prime is 648974011409. The reversal of 648974011381 is 183110479846.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 633982212900 + 14991798481 = 796230^2 + 122441^2 .

It is a cyclic number.

It is not a de Polignac number, because 648974011381 - 2³ = 648974011373 is a prime.

It is a super-2 number, since 2×648974011381² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (648974011321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324487005690 + 324487005691.

It is an arithmetic number, because the mean of its divisors is an integer number (324487005691).

Almost surely, 2^648974011381 is an apocalyptic number.

It is an amenable number.

648974011381 is a deficient number, since it is larger than the sum of its proper divisors (1).

648974011381 is an equidigital number, since it uses as much as digits as its factorization.

648974011381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1161216, while the sum is 52.

The spelling of 648974011381 in words is "six hundred forty-eight billion, nine hundred seventy-four million, eleven thousand, three hundred eighty-one".