40444627661 has 4 divisors (see below), whose sum is σ = 40447756800. Its totient is φ = 40441498524.

The previous prime is 40444627651. The next prime is 40444627673. The reversal of 40444627661 is 16672644404.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-40444627661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40444627651) 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, 1545101 + ... + 1571058.

It is an arithmetic number, because the mean of its divisors is an integer number (10111939200).

Almost surely, 2^40444627661 is an apocalyptic number.

It is an amenable number.

40444627661 is a deficient number, since it is larger than the sum of its proper divisors (3129139).

40444627661 is a wasteful number, since it uses less digits than its factorization.

40444627661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3129138.

The product of its (nonzero) digits is 774144, while the sum is 44.

The spelling of 40444627661 in words is "forty billion, four hundred forty-four million, six hundred twenty-seven thousand, six hundred sixty-one".