7681264391377 has 2 divisors, whose sum is σ = 7681264391378. Its totient is φ = 7681264391376.

The previous prime is 7681264391329. The next prime is 7681264391401. The reversal of 7681264391377 is 7731934621867.

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., 7554164298256 + 127100093121 = 2748484^2 + 356511^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7681264391377 is a prime.

It is a super-2 number, since 2×7681264391377² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7681264391077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3840632195688 + 3840632195689.

It is an arithmetic number, because the mean of its divisors is an integer number (3840632195689).

Almost surely, 2^{7681264391377} is an apocalyptic number.

It is an amenable number.

7681264391377 is a deficient number, since it is larger than the sum of its proper divisors (1).

7681264391377 is an equidigital number, since it uses as much as digits as its factorization.

7681264391377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64012032, while the sum is 64.

The spelling of 7681264391377 in words is "seven trillion, six hundred eighty-one billion, two hundred sixty-four million, three hundred ninety-one thousand, three hundred seventy-seven".