764517691493 has 4 divisors (see below), whose sum is σ = 790880370540. Its totient is φ = 738155012448.

The previous prime is 764517691463. The next prime is 764517691519. The reversal of 764517691493 is 394196715467.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 400718118529 + 363799572964 = 633023^2 + 603158^2 .

It is a cyclic number.

It is not a de Polignac number, because 764517691493 - 2¹⁶ = 764517625957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (764517691463) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13181339480 + ... + 13181339537.

It is an arithmetic number, because the mean of its divisors is an integer number (197720092635).

Almost surely, 2^764517691493 is an apocalyptic number.

It is an amenable number.

764517691493 is a deficient number, since it is larger than the sum of its proper divisors (26362679047).

764517691493 is a wasteful number, since it uses less digits than its factorization.

764517691493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26362679046.

The product of its digits is 34292160, while the sum is 62.

The spelling of 764517691493 in words is "seven hundred sixty-four billion, five hundred seventeen million, six hundred ninety-one thousand, four hundred ninety-three".