40644102661 has 4 divisors (see below), whose sum is σ = 40647369024. Its totient is φ = 40640836300.

The previous prime is 40644102641. The next prime is 40644102701. The reversal of 40644102661 is 16620144604.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40644102661 - 2¹⁹ = 40643578373 is a prime.

It is a super-2 number, since 2×40644102661² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40644102601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1614445 + ... + 1639426.

It is an arithmetic number, because the mean of its divisors is an integer number (10161842256).

Almost surely, 2^40644102661 is an apocalyptic number.

It is an amenable number.

40644102661 is a deficient number, since it is larger than the sum of its proper divisors (3266363).

40644102661 is a wasteful number, since it uses less digits than its factorization.

40644102661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3266362.

The product of its (nonzero) digits is 27648, while the sum is 34.

The spelling of 40644102661 in words is "forty billion, six hundred forty-four million, one hundred two thousand, six hundred sixty-one".