15680673749 has 4 divisors (see below), whose sum is σ = 16886879436. Its totient is φ = 14474468064.

The previous prime is 15680673719. The next prime is 15680673751. The reversal of 15680673749 is 94737608651.

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 2497500625 + 13183173124 = 49975^2 + 114818^2 .

It is a cyclic number.

It is not a de Polignac number, because 15680673749 - 2²⁰ = 15679625173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 15680673694 and 15680673703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15680673719) 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, 603102824 + ... + 603102849.

It is an arithmetic number, because the mean of its divisors is an integer number (4221719859).

Almost surely, 2^15680673749 is an apocalyptic number.

It is an amenable number.

15680673749 is a deficient number, since it is larger than the sum of its proper divisors (1206205687).

15680673749 is a wasteful number, since it uses less digits than its factorization.

15680673749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1206205686.

The product of its (nonzero) digits is 7620480, while the sum is 56.

The spelling of 15680673749 in words is "fifteen billion, six hundred eighty million, six hundred seventy-three thousand, seven hundred forty-nine".