15749091649 has 4 divisors (see below), whose sum is σ = 15771884080. Its totient is φ = 15726299220.

The previous prime is 15749091647. The next prime is 15749091707. The reversal of 15749091649 is 94619094751.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94619094751 = 17 ⋅5565829103.

It is a cyclic number.

It is not a de Polignac number, because 15749091649 - 2¹ = 15749091647 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15749091649.

It is not an unprimeable number, because it can be changed into a prime (15749091641) 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, 11395179 + ... + 11396560.

It is an arithmetic number, because the mean of its divisors is an integer number (3942971020).

Almost surely, 2^15749091649 is an apocalyptic number.

It is an amenable number.

15749091649 is a deficient number, since it is larger than the sum of its proper divisors (22792431).

15749091649 is an equidigital number, since it uses as much as digits as its factorization.

15749091649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22792430.

The product of its (nonzero) digits is 2449440, while the sum is 55.

The spelling of 15749091649 in words is "fifteen billion, seven hundred forty-nine million, ninety-one thousand, six hundred forty-nine".