19161236796025 has 45 divisors (see below), whose sum is σ = 24578910668015. Its totient is φ = 14818222146000.

The previous prime is 19161236796017. The next prime is 19161236796041. The reversal of 19161236796025 is 52069763216191.

The square root of 19161236796025 is 4377355.

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

It can be written as a sum of positive squares in only one way, i.e., 6898045246569 + 12263191549456 = 2626413^2 + 3501884^2 .

It is not a de Polignac number, because 19161236796025 - 2³ = 19161236796017 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 21033190320 + ... + 21033191230.

Almost surely, 2^{19161236796025} is an apocalyptic number.

19161236796025 is the 4377355-th square number.

19161236796025 is the 2188678-th centered octagonal number.

It is an amenable number.

19161236796025 is a deficient number, since it is larger than the sum of its proper divisors (5417673871990).

19161236796025 is an frugal number, since it uses more digits than its factorization.

19161236796025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1956 (or 947 counting only the distinct ones).

The product of its (nonzero) digits is 7348320, while the sum is 58.

The spelling of 19161236796025 in words is "nineteen trillion, one hundred sixty-one billion, two hundred thirty-six million, seven hundred ninety-six thousand, twenty-five".