15715871861 has 2 divisors, whose sum is σ = 15715871862. Its totient is φ = 15715871860.

The previous prime is 15715871851. The next prime is 15715871923. The reversal of 15715871861 is 16817851751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11541419761 + 4174452100 = 107431^2 + 64610^2 .

It is a cyclic number.

It is not a de Polignac number, because 15715871861 - 2²² = 15711677557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15715871851) 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 as a sum of consecutive naturals, namely, 7857935930 + 7857935931.

It is an arithmetic number, because the mean of its divisors is an integer number (7857935931).

Almost surely, 2^15715871861 is an apocalyptic number.

It is an amenable number.

15715871861 is a deficient number, since it is larger than the sum of its proper divisors (1).

15715871861 is an equidigital number, since it uses as much as digits as its factorization.

15715871861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 470400, while the sum is 50.

The spelling of 15715871861 in words is "fifteen billion, seven hundred fifteen million, eight hundred seventy-one thousand, eight hundred sixty-one".