764625238549 has 2 divisors, whose sum is σ = 764625238550. Its totient is φ = 764625238548.

The previous prime is 764625238499. The next prime is 764625238603. The reversal of 764625238549 is 945832526467.

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., 750661089649 + 13964148900 = 866407^2 + 118170^2 .

It is a cyclic number.

It is not a de Polignac number, because 764625238549 - 2³¹ = 762477754901 is a prime.

It is a super-2 number, since 2×764625238549² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (764625233549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 382312619274 + 382312619275.

It is an arithmetic number, because the mean of its divisors is an integer number (382312619275).

Almost surely, 2^764625238549 is an apocalyptic number.

It is an amenable number.

764625238549 is a deficient number, since it is larger than the sum of its proper divisors (1).

764625238549 is an equidigital number, since it uses as much as digits as its factorization.

764625238549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 87091200, while the sum is 61.

The spelling of 764625238549 in words is "seven hundred sixty-four billion, six hundred twenty-five million, two hundred thirty-eight thousand, five hundred forty-nine".