19975367987 has 2 divisors, whose sum is σ = 19975367988. Its totient is φ = 19975367986.

The previous prime is 19975367953. The next prime is 19975368029. The reversal of 19975367987 is 78976357991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19975367987 - 2²⁶ = 19908259123 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19975367987.

It is not a weakly prime, because it can be changed into another prime (19975267987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9987683993 + 9987683994.

It is an arithmetic number, because the mean of its divisors is an integer number (9987683994).

Almost surely, 2^19975367987 is an apocalyptic number.

19975367987 is a deficient number, since it is larger than the sum of its proper divisors (1).

19975367987 is an equidigital number, since it uses as much as digits as its factorization.

19975367987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 180033840, while the sum is 71.

The spelling of 19975367987 in words is "nineteen billion, nine hundred seventy-five million, three hundred sixty-seven thousand, nine hundred eighty-seven".