15915087301661 has 2 divisors, whose sum is σ = 15915087301662. Its totient is φ = 15915087301660.

The previous prime is 15915087301601. The next prime is 15915087301721. The reversal of 15915087301661 is 16610378051951.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (15915087301601) and next prime (15915087301721).

It can be written as a sum of positive squares in only one way, i.e., 12176568376036 + 3738518925625 = 3489494^2 + 1933525^2 .

It is a cyclic number.

It is not a de Polignac number, because 15915087301661 - 2⁴² = 11517040790557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15915087301601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7957543650830 + 7957543650831.

It is an arithmetic number, because the mean of its divisors is an integer number (7957543650831).

Almost surely, 2^{15915087301661} is an apocalyptic number.

It is an amenable number.

15915087301661 is a deficient number, since it is larger than the sum of its proper divisors (1).

15915087301661 is an equidigital number, since it uses as much as digits as its factorization.

15915087301661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1360800, while the sum is 53.

The spelling of 15915087301661 in words is "fifteen trillion, nine hundred fifteen billion, eighty-seven million, three hundred one thousand, six hundred sixty-one".