19901961725 has 6 divisors (see below), whose sum is σ = 24678432570. Its totient is φ = 15921569360.

The previous prime is 19901961719. The next prime is 19901961733. The reversal of 19901961725 is 52716910991.

It can be written as a sum of positive squares in 3 ways, for example, as 4625496121 + 15276465604 = 68011^2 + 123598^2 .

It is not a de Polignac number, because 19901961725 - 2⁶ = 19901961661 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 398039210 + ... + 398039259.

It is an arithmetic number, because the mean of its divisors is an integer number (4113072095).

Almost surely, 2^19901961725 is an apocalyptic number.

It is an amenable number.

19901961725 is a deficient number, since it is larger than the sum of its proper divisors (4776470845).

19901961725 is an equidigital number, since it uses as much as digits as its factorization.

19901961725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 796078479 (or 796078474 counting only the distinct ones).

The product of its (nonzero) digits is 306180, while the sum is 50.

The spelling of 19901961725 in words is "nineteen billion, nine hundred one million, nine hundred sixty-one thousand, seven hundred twenty-five".