19965947347725 has 24 divisors (see below), whose sum is σ = 34148654777760. Its totient is φ = 10281315414720.

The previous prime is 19965947347679. The next prime is 19965947347741. The reversal of 19965947347725 is 52774374956991.

It is not a de Polignac number, because 19965947347725 - 2⁷ = 19965947347597 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4589870779 + ... + 4589875128.

It is an arithmetic number, because the mean of its divisors is an integer number (1422860615740).

Almost surely, 2^{19965947347725} is an apocalyptic number.

19965947347725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19965947347725 is a deficient number, since it is larger than the sum of its proper divisors (14182707430035).

19965947347725 is a wasteful number, since it uses less digits than its factorization.

19965947347725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9179745949 (or 9179745944 counting only the distinct ones).

The product of its digits is 3600676800, while the sum is 78.

The spelling of 19965947347725 in words is "nineteen trillion, nine hundred sixty-five billion, nine hundred forty-seven million, three hundred forty-seven thousand, seven hundred twenty-five".