40809781963 has 2 divisors, whose sum is σ = 40809781964. Its totient is φ = 40809781962.

The previous prime is 40809781937. The next prime is 40809781993. The reversal of 40809781963 is 36918790804.

40809781963 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40809781963 is a prime.

It is not a weakly prime, because it can be changed into another prime (40809781913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20404890981 + 20404890982.

It is an arithmetic number, because the mean of its divisors is an integer number (20404890982).

Almost surely, 2^40809781963 is an apocalyptic number.

40809781963 is a deficient number, since it is larger than the sum of its proper divisors (1).

40809781963 is an equidigital number, since it uses as much as digits as its factorization.

40809781963 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2612736, while the sum is 55.

The spelling of 40809781963 in words is "forty billion, eight hundred nine million, seven hundred eighty-one thousand, nine hundred sixty-three".