15851161947 has 16 divisors (see below), whose sum is σ = 22491719712. Its totient is φ = 9895334400.

The previous prime is 15851161943. The next prime is 15851162021. The reversal of 15851161947 is 74916115851.

It is not a de Polignac number, because 15851161947 - 2² = 15851161943 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15851161896 and 15851161905.

It is not an unprimeable number, because it can be changed into a prime (15851161943) 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, 778804 + ... + 798897.

It is an arithmetic number, because the mean of its divisors is an integer number (1405732482).

Almost surely, 2^15851161947 is an apocalyptic number.

15851161947 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

15851161947 is a deficient number, since it is larger than the sum of its proper divisors (6640557765).

15851161947 is a wasteful number, since it uses less digits than its factorization.

15851161947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1577918.

The product of its digits is 302400, while the sum is 48.

The spelling of 15851161947 in words is "fifteen billion, eight hundred fifty-one million, one hundred sixty-one thousand, nine hundred forty-seven".