19965139201 has 16 divisors (see below), whose sum is σ = 24207984000. Its totient is φ = 16074005760.

The previous prime is 19965139193. The next prime is 19965139211. The reversal of 19965139201 is 10293156991.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 19965139201 - 2³ = 19965139193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19965139211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108730 + ... + 227491.

It is an arithmetic number, because the mean of its divisors is an integer number (1512999000).

Almost surely, 2^19965139201 is an apocalyptic number.

It is an amenable number.

19965139201 is a deficient number, since it is larger than the sum of its proper divisors (4242844799).

19965139201 is a wasteful number, since it uses less digits than its factorization.

19965139201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336744.

The product of its (nonzero) digits is 131220, while the sum is 46.

The spelling of 19965139201 in words is "nineteen billion, nine hundred sixty-five million, one hundred thirty-nine thousand, two hundred one".