19440641725 has 48 divisors (see below), whose sum is σ = 25488654336. Its totient is φ = 14687064000.

The previous prime is 19440641719. The next prime is 19440641729. The reversal of 19440641725 is 52714604491.

It is not a de Polignac number, because 19440641725 - 2¹¹ = 19440639677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19440641729) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 17884132 + ... + 17885218.

It is an arithmetic number, because the mean of its divisors is an integer number (531013632).

Almost surely, 2^19440641725 is an apocalyptic number.

It is an amenable number.

19440641725 is a deficient number, since it is larger than the sum of its proper divisors (6048012611).

19440641725 is a wasteful number, since it uses less digits than its factorization.

19440641725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1666 (or 1661 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 43.

The spelling of 19440641725 in words is "nineteen billion, four hundred forty million, six hundred forty-one thousand, seven hundred twenty-five".