15919661103025 has 27 divisors (see below), whose sum is σ = 19925867418723. Its totient is φ = 12617163676800.

The previous prime is 15919661103011. The next prime is 15919661103113. The reversal of 15919661103025 is 52030116691951.

It is a happy number.

The square root of 15919661103025 is 3989945.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 13 ways, for example, as 15825176179569 + 94484923456 = 3978087^2 + 307384^2 .

It is not a de Polignac number, because 15919661103025 - 2¹³ = 15919661094833 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15919661103025.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 2174516365 + ... + 2174523685.

Almost surely, 2^{15919661103025} is an apocalyptic number.

15919661103025 is the 3989945-th square number.

15919661103025 is the 1994973-rd centered octagonal number.

It is an amenable number.

15919661103025 is a deficient number, since it is larger than the sum of its proper divisors (4006206315698).

15919661103025 is an frugal number, since it uses more digits than its factorization.

15919661103025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14870 (or 7435 counting only the distinct ones).

The product of its (nonzero) digits is 437400, while the sum is 49.

Multiplying 15919661103025 by its sum of digits (49), we get a square (780063394048225 = 27929615²).

Adding to 15919661103025 its reverse (52030116691951), we get a palindrome (67949777794976).

The spelling of 15919661103025 in words is "fifteen trillion, nine hundred nineteen billion, six hundred sixty-one million, one hundred three thousand, twenty-five".