15961043947 has 2 divisors, whose sum is σ = 15961043948. Its totient is φ = 15961043946.

The previous prime is 15961043941. The next prime is 15961043953. The reversal of 15961043947 is 74934016951.

It is a balanced prime because it is at equal distance from previous prime (15961043941) and next prime (15961043953).

It is a cyclic number.

It is not a de Polignac number, because 15961043947 - 2³ = 15961043939 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15961043947.

It is not a weakly prime, because it can be changed into another prime (15961043941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7980521973 + 7980521974.

It is an arithmetic number, because the mean of its divisors is an integer number (7980521974).

Almost surely, 2^15961043947 is an apocalyptic number.

15961043947 is a deficient number, since it is larger than the sum of its proper divisors (1).

15961043947 is an equidigital number, since it uses as much as digits as its factorization.

15961043947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 816480, while the sum is 49.

The spelling of 15961043947 in words is "fifteen billion, nine hundred sixty-one million, forty-three thousand, nine hundred forty-seven".