19940375087 has 2 divisors, whose sum is σ = 19940375088. Its totient is φ = 19940375086.

The previous prime is 19940375041. The next prime is 19940375107. The reversal of 19940375087 is 78057304991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19940375087 - 2¹⁴ = 19940358703 is a prime.

It is a super-2 number, since 2×19940375087² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19940375027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9970187543 + 9970187544.

It is an arithmetic number, because the mean of its divisors is an integer number (9970187544).

Almost surely, 2^19940375087 is an apocalyptic number.

19940375087 is a deficient number, since it is larger than the sum of its proper divisors (1).

19940375087 is an equidigital number, since it uses as much as digits as its factorization.

19940375087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1905120, while the sum is 53.

The spelling of 19940375087 in words is "nineteen billion, nine hundred forty million, three hundred seventy-five thousand, eighty-seven".