42919721863 has 2 divisors, whose sum is σ = 42919721864. Its totient is φ = 42919721862.

The previous prime is 42919721833. The next prime is 42919721879. The reversal of 42919721863 is 36812791924.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42919721863 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42919721863.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42919721833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21459860931 + 21459860932.

It is an arithmetic number, because the mean of its divisors is an integer number (21459860932).

Almost surely, 2^42919721863 is an apocalyptic number.

42919721863 is a deficient number, since it is larger than the sum of its proper divisors (1).

42919721863 is an equidigital number, since it uses as much as digits as its factorization.

42919721863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 52.

The spelling of 42919721863 in words is "forty-two billion, nine hundred nineteen million, seven hundred twenty-one thousand, eight hundred sixty-three".