19868413951 has 2 divisors, whose sum is σ = 19868413952. Its totient is φ = 19868413950.

The previous prime is 19868413937. The next prime is 19868413991. The reversal of 19868413951 is 15931486891.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19868413951 - 2¹³ = 19868405759 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19868413892 and 19868413901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19868413991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9934206975 + 9934206976.

It is an arithmetic number, because the mean of its divisors is an integer number (9934206976).

Almost surely, 2^19868413951 is an apocalyptic number.

19868413951 is a deficient number, since it is larger than the sum of its proper divisors (1).

19868413951 is an equidigital number, since it uses as much as digits as its factorization.

19868413951 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1866240, while the sum is 55.

The spelling of 19868413951 in words is "nineteen billion, eight hundred sixty-eight million, four hundred thirteen thousand, nine hundred fifty-one".