19651970137 has 2 divisors, whose sum is σ = 19651970138. Its totient is φ = 19651970136.

The previous prime is 19651970113. The next prime is 19651970171. The reversal of 19651970137 is 73107915691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12114084096 + 7537886041 = 110064^2 + 86821^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19651970137 is a prime.

It is not a weakly prime, because it can be changed into another prime (19651974137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9825985068 + 9825985069.

It is an arithmetic number, because the mean of its divisors is an integer number (9825985069).

Almost surely, 2^19651970137 is an apocalyptic number.

It is an amenable number.

19651970137 is a deficient number, since it is larger than the sum of its proper divisors (1).

19651970137 is an equidigital number, since it uses as much as digits as its factorization.

19651970137 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 357210, while the sum is 49.

The spelling of 19651970137 in words is "nineteen billion, six hundred fifty-one million, nine hundred seventy thousand, one hundred thirty-seven".