19980497702025 has 81 divisors (see below), whose sum is σ = 41631092453223. Its totient is φ = 9133727248800.

The previous prime is 19980497701999. The next prime is 19980497702041. The reversal of 19980497702025 is 52020779408991.

The square root of 19980497702025 is 4469955.

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

19980497702025 is a `hidden beast` number, since 19 + 98 + 0 + 497 + 7 + 0 + 20 + 25 = 666.

It can be written as a sum of positive squares in only one way, i.e., 7192979172729 + 12787518529296 = 2681973^2 + 3575964^2 .

It is not a de Polignac number, because 19980497702025 - 2²³ = 19980489313417 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 469323990 + ... + 469366560.

Almost surely, 2^{19980497702025} is an apocalyptic number.

19980497702025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

19980497702025 is the 4469955-th square number.

19980497702025 is the 2234978-th centered octagonal number.

It is an amenable number.

19980497702025 is an abundant number, since it is smaller than the sum of its proper divisors (21650594751198).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19980497702025 is an frugal number, since it uses more digits than its factorization.

19980497702025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85172 (or 42586 counting only the distinct ones).

The product of its (nonzero) digits is 22861440, while the sum is 63.

The spelling of 19980497702025 in words is "nineteen trillion, nine hundred eighty billion, four hundred ninety-seven million, seven hundred two thousand, twenty-five".