40322578861 has 2 divisors, whose sum is σ = 40322578862. Its totient is φ = 40322578860.

The previous prime is 40322578859. The next prime is 40322578883. The reversal of 40322578861 is 16887522304.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37616602500 + 2705976361 = 193950^2 + 52019^2 .

It is a cyclic number.

It is not a de Polignac number, because 40322578861 - 2¹ = 40322578859 is a prime.

Together with 40322578859, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40322578811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20161289430 + 20161289431.

It is an arithmetic number, because the mean of its divisors is an integer number (20161289431).

Almost surely, 2^40322578861 is an apocalyptic number.

It is an amenable number.

40322578861 is a deficient number, since it is larger than the sum of its proper divisors (1).

40322578861 is an equidigital number, since it uses as much as digits as its factorization.

40322578861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 645120, while the sum is 46.

The spelling of 40322578861 in words is "forty billion, three hundred twenty-two million, five hundred seventy-eight thousand, eight hundred sixty-one".