19667249873 has 2 divisors, whose sum is σ = 19667249874. Its totient is φ = 19667249872.

The previous prime is 19667249761. The next prime is 19667249879. The reversal of 19667249873 is 37894276691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19619044624 + 48205249 = 140068^2 + 6943^2 .

It is a cyclic number.

It is not a de Polignac number, because 19667249873 - 2¹⁰ = 19667248849 is a prime.

It is a super-2 number, since 2×19667249873² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19667249879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9833624936 + 9833624937.

It is an arithmetic number, because the mean of its divisors is an integer number (9833624937).

Almost surely, 2^19667249873 is an apocalyptic number.

It is an amenable number.

19667249873 is a deficient number, since it is larger than the sum of its proper divisors (1).

19667249873 is an equidigital number, since it uses as much as digits as its factorization.

19667249873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27433728, while the sum is 62.

The spelling of 19667249873 in words is "nineteen billion, six hundred sixty-seven million, two hundred forty-nine thousand, eight hundred seventy-three".