768748047761 has 4 divisors (see below), whose sum is σ = 768751631652. Its totient is φ = 768744463872.

The previous prime is 768748047733. The next prime is 768748047763. The reversal of 768748047761 is 167740847867.

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 416676705025 + 352071342736 = 645505^2 + 593356^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-768748047761 is a prime.

It is a super-2 number, since 2×768748047761² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (768748047763) 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, 1448216 + ... + 1906521.

It is an arithmetic number, because the mean of its divisors is an integer number (192187907913).

Almost surely, 2^768748047761 is an apocalyptic number.

It is an amenable number.

768748047761 is a deficient number, since it is larger than the sum of its proper divisors (3583891).

768748047761 is a wasteful number, since it uses less digits than its factorization.

768748047761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3583890.

The product of its (nonzero) digits is 88510464, while the sum is 65.

The spelling of 768748047761 in words is "seven hundred sixty-eight billion, seven hundred forty-eight million, forty-seven thousand, seven hundred sixty-one".