40644426013423 has 4 divisors (see below), whose sum is σ = 40644478574568. Its totient is φ = 40644373452280.

The previous prime is 40644426013379. The next prime is 40644426013489. The reversal of 40644426013423 is 32431062444604.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40644426013423 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40644426013423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40644426013223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25103068 + ... + 26673073.

It is an arithmetic number, because the mean of its divisors is an integer number (10161119643642).

Almost surely, 2^{40644426013423} is an apocalyptic number.

40644426013423 is a deficient number, since it is larger than the sum of its proper divisors (52561145).

40644426013423 is an equidigital number, since it uses as much as digits as its factorization.

40644426013423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52561144.

The product of its (nonzero) digits is 1327104, while the sum is 43.

The spelling of 40644426013423 in words is "forty trillion, six hundred forty-four billion, four hundred twenty-six million, thirteen thousand, four hundred twenty-three".