19900378499 has 2 divisors, whose sum is σ = 19900378500. Its totient is φ = 19900378498.

The previous prime is 19900378447. The next prime is 19900378507. The reversal of 19900378499 is 99487300991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19900378499 - 2¹⁶ = 19900312963 is a prime.

It is a super-2 number, since 2×19900378499² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19900378409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9950189249 + 9950189250.

It is an arithmetic number, because the mean of its divisors is an integer number (9950189250).

Almost surely, 2^19900378499 is an apocalyptic number.

19900378499 is a deficient number, since it is larger than the sum of its proper divisors (1).

19900378499 is an equidigital number, since it uses as much as digits as its factorization.

19900378499 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4408992, while the sum is 59.

The spelling of 19900378499 in words is "nineteen billion, nine hundred million, three hundred seventy-eight thousand, four hundred ninety-nine".