15591434394 has 16 divisors (see below), whose sum is σ = 31330657440. Its totient is φ = 5172513360.

The previous prime is 15591434377. The next prime is 15591434431. The reversal of 15591434394 is 49343419551.

It is a happy number.

It is a super-2 number, since 2×15591434394² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6156489 + ... + 6159020.

It is an arithmetic number, because the mean of its divisors is an integer number (1958166090).

Almost surely, 2^15591434394 is an apocalyptic number.

15591434394 is an abundant number, since it is smaller than the sum of its proper divisors (15739223046).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15591434394 is a wasteful number, since it uses less digits than its factorization.

15591434394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12315725.

The product of its digits is 1166400, while the sum is 48.

The spelling of 15591434394 in words is "fifteen billion, five hundred ninety-one million, four hundred thirty-four thousand, three hundred ninety-four".