19772015769 has 27 divisors (see below), whose sum is σ = 31399302207. Its totient is φ = 11980227600.

The previous prime is 19772015759. The next prime is 19772015773. The reversal of 19772015769 is 96751027791.

It is a happy number.

The square root of 19772015769 is 140613.

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., 19109468169 + 662547600 = 138237^2 + 25740^2 .

It is not a de Polignac number, because 19772015769 - 2¹⁵ = 19771983001 is a prime.

It is a super-2 number, since 2×19772015769² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19772015759) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 4638099 + ... + 4642359.

Almost surely, 2^19772015769 is an apocalyptic number.

19772015769 is the 140613-rd square number.

19772015769 is the 70307-th centered octagonal number.

It is an amenable number.

19772015769 is a deficient number, since it is larger than the sum of its proper divisors (11627286438).

19772015769 is an frugal number, since it uses more digits than its factorization.

19772015769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8550 (or 4275 counting only the distinct ones).

The product of its (nonzero) digits is 1666980, while the sum is 54.

The spelling of 19772015769 in words is "nineteen billion, seven hundred seventy-two million, fifteen thousand, seven hundred sixty-nine".