7685128295431 has 2 divisors, whose sum is σ = 7685128295432. Its totient is φ = 7685128295430.

The previous prime is 7685128295417. The next prime is 7685128295441. The reversal of 7685128295431 is 1345928215867.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 7685128295431 - 2³⁹ = 7135372481543 is a prime.

It is a super-2 number, since 2×7685128295431² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7685128295431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7685128295401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3842564147715 + 3842564147716.

It is an arithmetic number, because the mean of its divisors is an integer number (3842564147716).

Almost surely, 2^{7685128295431} is an apocalyptic number.

7685128295431 is a deficient number, since it is larger than the sum of its proper divisors (1).

7685128295431 is an equidigital number, since it uses as much as digits as its factorization.

7685128295431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29030400, while the sum is 61.

The spelling of 7685128295431 in words is "seven trillion, six hundred eighty-five billion, one hundred twenty-eight million, two hundred ninety-five thousand, four hundred thirty-one".