756496740721 has 4 divisors (see below), whose sum is σ = 758639791332. Its totient is φ = 754353690112.

The previous prime is 756496740719. The next prime is 756496740733. The reversal of 756496740721 is 127047694657.

It is a happy number.

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 157320116496 + 599176624225 = 396636^2 + 774065^2 .

It is a cyclic number.

It is not a de Polignac number, because 756496740721 - 2¹ = 756496740719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (756496740751) 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, 1071524776 + ... + 1071525481.

It is an arithmetic number, because the mean of its divisors is an integer number (189659947833).

Almost surely, 2^756496740721 is an apocalyptic number.

It is an amenable number.

756496740721 is a deficient number, since it is larger than the sum of its proper divisors (2143050611).

756496740721 is a wasteful number, since it uses less digits than its factorization.

756496740721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2143050610.

The product of its (nonzero) digits is 17781120, while the sum is 58.

The spelling of 756496740721 in words is "seven hundred fifty-six billion, four hundred ninety-six million, seven hundred forty thousand, seven hundred twenty-one".