15902279078401 has 2 divisors, whose sum is σ = 15902279078402. Its totient is φ = 15902279078400.

The previous prime is 15902279078293. The next prime is 15902279078423. The reversal of 15902279078401 is 10487097220951.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12523211604225 + 3379067474176 = 3538815^2 + 1838224^2 .

It is a cyclic number.

It is not a de Polignac number, because 15902279078401 - 2¹¹ = 15902279076353 is a prime.

It is not a weakly prime, because it can be changed into another prime (15902279078461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7951139539200 + 7951139539201.

It is an arithmetic number, because the mean of its divisors is an integer number (7951139539201).

Almost surely, 2^{15902279078401} is an apocalyptic number.

It is an amenable number.

15902279078401 is a deficient number, since it is larger than the sum of its proper divisors (1).

15902279078401 is an equidigital number, since it uses as much as digits as its factorization.

15902279078401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2540160, while the sum is 55.

The spelling of 15902279078401 in words is "fifteen trillion, nine hundred two billion, two hundred seventy-nine million, seventy-eight thousand, four hundred one".