15806958949 has 4 divisors (see below), whose sum is σ = 15807227980. Its totient is φ = 15806689920.

The previous prime is 15806958943. The next prime is 15806958961. The reversal of 15806958949 is 94985960851.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94985960851 = 48163 ⋅1972177.

It can be written as a sum of positive squares in 2 ways, for example, as 790172100 + 15016786849 = 28110^2 + 122543^2 .

It is a cyclic number.

It is not a de Polignac number, because 15806958949 - 2⁵ = 15806958917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15806958943) 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, 4482 + ... + 177859.

It is an arithmetic number, because the mean of its divisors is an integer number (3951806995).

Almost surely, 2^15806958949 is an apocalyptic number.

It is an amenable number.

15806958949 is a deficient number, since it is larger than the sum of its proper divisors (269031).

15806958949 is an equidigital number, since it uses as much as digits as its factorization.

15806958949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269030.

The product of its (nonzero) digits is 27993600, while the sum is 64.

The spelling of 15806958949 in words is "fifteen billion, eight hundred six million, nine hundred fifty-eight thousand, nine hundred forty-nine".