15849667805 has 4 divisors (see below), whose sum is σ = 19019601372. Its totient is φ = 12679734240.

The previous prime is 15849667787. The next prime is 15849667831. The reversal of 15849667805 is 50876694851.

It is a happy number.

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 9177065209 + 6672602596 = 95797^2 + 81686^2 .

It is not a de Polignac number, because 15849667805 - 2¹⁶ = 15849602269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1584966776 + ... + 1584966785.

It is an arithmetic number, because the mean of its divisors is an integer number (4754900343).

Almost surely, 2^15849667805 is an apocalyptic number.

It is an amenable number.

15849667805 is a deficient number, since it is larger than the sum of its proper divisors (3169933567).

15849667805 is an equidigital number, since it uses as much as digits as its factorization.

15849667805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3169933566.

The product of its (nonzero) digits is 14515200, while the sum is 59.

The spelling of 15849667805 in words is "fifteen billion, eight hundred forty-nine million, six hundred sixty-seven thousand, eight hundred five".