40680785721 has 8 divisors (see below), whose sum is σ = 54377676544. Its totient is φ = 27052209360.

The previous prime is 40680785693. The next prime is 40680785773. The reversal of 40680785721 is 12758708604.

40680785721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40680785721 - 2⁹ = 40680785209 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40680784721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17077225 + ... + 17079606.

It is an arithmetic number, because the mean of its divisors is an integer number (6797209568).

Almost surely, 2^40680785721 is an apocalyptic number.

It is an amenable number.

40680785721 is a deficient number, since it is larger than the sum of its proper divisors (13696890823).

40680785721 is a wasteful number, since it uses less digits than its factorization.

40680785721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34157231.

The product of its (nonzero) digits is 752640, while the sum is 48.

It can be divided in two parts, 406807 and 85721, that added together give a triangular number (492528 = T₉₉₂).

The spelling of 40680785721 in words is "forty billion, six hundred eighty million, seven hundred eighty-five thousand, seven hundred twenty-one".