19863021672025 has 45 divisors (see below), whose sum is σ = 28735041267263. Its totient is φ = 13619608976400.

The previous prime is 19863021672007. The next prime is 19863021672047. The reversal of 19863021672025 is 52027612036891.

The square root of 19863021672025 is 4456795.

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., 7150687801929 + 12712333870096 = 2674077^2 + 3565436^2 .

It is a de Polignac number, because none of the positive numbers 2^k-19863021672025 is a prime.

It is a Duffinian number.

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, 1091905680 + ... + 1091923870.

Almost surely, 2^{19863021672025} is an apocalyptic number.

19863021672025 is the 4456795-th square number.

19863021672025 is the 2228398-th centered octagonal number.

It is an amenable number.

19863021672025 is a deficient number, since it is larger than the sum of its proper divisors (8872019595238).

19863021672025 is an frugal number, since it uses more digits than its factorization.

19863021672025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36420 (or 18203 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 52.

The spelling of 19863021672025 in words is "nineteen trillion, eight hundred sixty-three billion, twenty-one million, six hundred seventy-two thousand, twenty-five".