15538142004025 has 9 divisors (see below), whose sum is σ = 19267320524461. Its totient is φ = 12430497835840.

The previous prime is 15538142004019. The next prime is 15538142004053. The reversal of 15538142004025 is 52040024183551.

It is a happy number.

The square root of 15538142004025 is 3941845.

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

It can be written as a sum of positive squares in 4 ways, for example, as 4291804158889 + 11246337845136 = 2071667^2 + 3353556^2 .

It is not a de Polignac number, because 15538142004025 - 2³³ = 15529552069433 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 19315041 + ... + 20103409.

Almost surely, 2^{15538142004025} is an apocalyptic number.

15538142004025 is the 3941845-th square number.

15538142004025 is the 1970923-rd centered octagonal number.

It is an amenable number.

15538142004025 is a deficient number, since it is larger than the sum of its proper divisors (3729178520436).

15538142004025 is an frugal number, since it uses more digits than its factorization.

15538142004025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1576748 (or 788374 counting only the distinct ones).

The product of its (nonzero) digits is 192000, while the sum is 40.

Adding to 15538142004025 its reverse (52040024183551), we get a palindrome (67578166187576).

The spelling of 15538142004025 in words is "fifteen trillion, five hundred thirty-eight billion, one hundred forty-two million, four thousand, twenty-five".