76899172249 has 9 divisors (see below), whose sum is σ = 78741324543. Its totient is φ = 75099172512.

The previous prime is 76899172241. The next prime is 76899172253. The reversal of 76899172249 is 94227199867.

The square root of 76899172249 is 277307.

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., 74579786649 + 2319385600 = 273093^2 + 48160^2 .

It is not a de Polignac number, because 76899172249 - 2³ = 76899172241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76899172241) 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, 11920977 + ... + 11927425.

Almost surely, 2^76899172249 is an apocalyptic number.

76899172249 is the 277307-th square number.

76899172249 is the 138654-th centered octagonal number.

It is an amenable number.

76899172249 is a deficient number, since it is larger than the sum of its proper divisors (1842152294).

76899172249 is an frugal number, since it uses more digits than its factorization.

76899172249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12984 (or 6492 counting only the distinct ones).

The product of its digits is 27433728, while the sum is 64.

Multiplying 76899172249 by its sum of digits (64), we get a square (4921547023936 = 2218456²).

The spelling of 76899172249 in words is "seventy-six billion, eight hundred ninety-nine million, one hundred seventy-two thousand, two hundred forty-nine".