19801242725 has 24 divisors (see below), whose sum is σ = 27045774912. Its totient is φ = 14261068800.

The previous prime is 19801242689. The next prime is 19801242733. The reversal of 19801242725 is 52724210891.

It is not a de Polignac number, because 19801242725 - 2⁶ = 19801242661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 321212 + ... + 377861.

It is an arithmetic number, because the mean of its divisors is an integer number (1126907288).

Almost surely, 2^19801242725 is an apocalyptic number.

It is an amenable number.

19801242725 is a deficient number, since it is larger than the sum of its proper divisors (7244532187).

19801242725 is a wasteful number, since it uses less digits than its factorization.

19801242725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 699197 (or 699192 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 41.

The spelling of 19801242725 in words is "nineteen billion, eight hundred one million, two hundred forty-two thousand, seven hundred twenty-five".