15779630689 has 3 divisors (see below), whose sum is σ = 15779756307. Its totient is φ = 15779505072.

The previous prime is 15779630551. The next prime is 15779630717. The reversal of 15779630689 is 98603697751.

The square root of 15779630689 is 125617.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 98603697751 = 13 ⋅7584899827.

It can be written as a sum of positive squares in only one way, i.e., 1043613025 + 14736017664 = 32305^2 + 121392^2 .

It is not a de Polignac number, because 15779630689 - 2²⁷ = 15645412961 is a prime.

It is a super-2 number, since 2×15779630689² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15779610689) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 62809 + ... + 188425.

It is an arithmetic number, because the mean of its divisors is an integer number (5259918769).

Almost surely, 2^15779630689 is an apocalyptic number.

15779630689 is the 125617-th square number.

15779630689 is the 62809-th centered octagonal number.

It is an amenable number.

15779630689 is a deficient number, since it is larger than the sum of its proper divisors (125618).

15779630689 is an frugal number, since it uses more digits than its factorization.

15779630689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251234 (or 125617 counting only the distinct ones).

The product of its (nonzero) digits is 17146080, while the sum is 61.

The spelling of 15779630689 in words is "fifteen billion, seven hundred seventy-nine million, six hundred thirty thousand, six hundred eighty-nine".