769899198721 has 9 divisors (see below), whose sum is σ = 812570489283. Its totient is φ = 729362394360.

The previous prime is 769899198701. The next prime is 769899198727. The reversal of 769899198721 is 127891998967.

The square root of 769899198721 is 877439.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 612210788721 + 157688410000 = 782439^2 + 397100^2 .

It is not a de Polignac number, because 769899198721 - 2⁵ = 769899198689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (769899198727) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 16648251 + ... + 16694431.

Almost surely, 2^769899198721 is an apocalyptic number.

769899198721 is the 877439-th square number.

769899198721 is the 438720-th centered octagonal number.

It is an amenable number.

769899198721 is a deficient number, since it is larger than the sum of its proper divisors (42671290562).

769899198721 is an frugal number, since it uses more digits than its factorization.

769899198721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92400 (or 46200 counting only the distinct ones).

The product of its digits is 246903552, while the sum is 76.

The spelling of 769899198721 in words is "seven hundred sixty-nine billion, eight hundred ninety-nine million, one hundred ninety-eight thousand, seven hundred twenty-one".