15947120643 has 16 divisors (see below), whose sum is σ = 21585586176. Its totient is φ = 10470358080.

The previous prime is 15947120617. The next prime is 15947120699. The reversal of 15947120643 is 34602174951.

It is not a de Polignac number, because 15947120643 - 2¹⁰ = 15947119619 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15947120595 and 15947120604.

It is not an unprimeable number, because it can be changed into a prime (15947120543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 159630 + ... + 239532.

It is an arithmetic number, because the mean of its divisors is an integer number (1349099136).

Almost surely, 2^15947120643 is an apocalyptic number.

15947120643 is a deficient number, since it is larger than the sum of its proper divisors (5638465533).

15947120643 is an equidigital number, since it uses as much as digits as its factorization.

15947120643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80914.

The product of its (nonzero) digits is 181440, while the sum is 42.

The spelling of 15947120643 in words is "fifteen billion, nine hundred forty-seven million, one hundred twenty thousand, six hundred forty-three".