15861460817 has 4 divisors (see below), whose sum is σ = 15875007216. Its totient is φ = 15847914420.

The previous prime is 15861460781. The next prime is 15861460861. The reversal of 15861460817 is 71806416851.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71806416851 = 13 ⋅5523570527.

It is a cyclic number.

It is not a de Polignac number, because 15861460817 - 2⁸ = 15861460561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15861360817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6771443 + ... + 6773784.

It is an arithmetic number, because the mean of its divisors is an integer number (3968751804).

Almost surely, 2^15861460817 is an apocalyptic number.

It is an amenable number.

15861460817 is a deficient number, since it is larger than the sum of its proper divisors (13546399).

15861460817 is a wasteful number, since it uses less digits than its factorization.

15861460817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13546398.

The product of its (nonzero) digits is 322560, while the sum is 47.

The spelling of 15861460817 in words is "fifteen billion, eight hundred sixty-one million, four hundred sixty thousand, eight hundred seventeen".