19999995937 has 2 divisors, whose sum is σ = 19999995938. Its totient is φ = 19999995936.

The previous prime is 19999995919. The next prime is 19999995971. The reversal of 19999995937 is 73959999991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18377598096 + 1622397841 = 135564^2 + 40279^2 .

It is an emirp because it is prime and its reverse (73959999991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19999995937 - 2⁷ = 19999995809 is a prime.

It is not a weakly prime, because it can be changed into another prime (19999995637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9999997968 + 9999997969.

It is an arithmetic number, because the mean of its divisors is an integer number (9999997969).

Almost surely, 2^19999995937 is an apocalyptic number.

It is an amenable number.

19999995937 is a deficient number, since it is larger than the sum of its proper divisors (1).

19999995937 is an equidigital number, since it uses as much as digits as its factorization.

19999995937 is an evil number, because the sum of its binary digits is even.

The product of its digits is 502211745, while the sum is 79.

It can be divided in two parts, 199999 and 95937, that added together give a square (295936 = 544²).

The spelling of 19999995937 in words is "nineteen billion, nine hundred ninety-nine million, nine hundred ninety-five thousand, nine hundred thirty-seven".