19975267987 has 2 divisors, whose sum is σ = 19975267988. Its totient is φ = 19975267986.

The previous prime is 19975267981. The next prime is 19975268011. The reversal of 19975267987 is 78976257991.

It is a weak prime.

It is an emirp because it is prime and its reverse (78976257991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19975267987 - 2¹¹ = 19975265939 is a prime.

It is a super-2 number, since 2×19975267987² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19975267981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9987633993 + 9987633994.

It is an arithmetic number, because the mean of its divisors is an integer number (9987633994).

Almost surely, 2^19975267987 is an apocalyptic number.

19975267987 is a deficient number, since it is larger than the sum of its proper divisors (1).

19975267987 is an equidigital number, since it uses as much as digits as its factorization.

19975267987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120022560, while the sum is 70.

The spelling of 19975267987 in words is "nineteen billion, nine hundred seventy-five million, two hundred sixty-seven thousand, nine hundred eighty-seven".