40644721701 has 32 divisors (see below), whose sum is σ = 63404016000. Its totient is φ = 25662075264.

The previous prime is 40644721697. The next prime is 40644721727. The reversal of 40644721701 is 10712744604.

It is a happy number.

40644721701 is a `hidden beast` number, since 4 + 0 + 644 + 7 + 2 + 1 + 7 + 0 + 1 = 666.

It is not a de Polignac number, because 40644721701 - 2² = 40644721697 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40644721801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1842505 + ... + 1864433.

It is an arithmetic number, because the mean of its divisors is an integer number (1981375500).

Almost surely, 2^40644721701 is an apocalyptic number.

It is an amenable number.

40644721701 is a deficient number, since it is larger than the sum of its proper divisors (22759294299).

40644721701 is a wasteful number, since it uses less digits than its factorization.

40644721701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25570 (or 25564 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 36.

The spelling of 40644721701 in words is "forty billion, six hundred forty-four million, seven hundred twenty-one thousand, seven hundred one".