40661720217 has 12 divisors (see below), whose sum is σ = 61287230784. Its totient is φ = 25929212760.

The previous prime is 40661720173. The next prime is 40661720219. The reversal of 40661720217 is 71202716604.

40661720217 is a `hidden beast` number, since 4 + 0 + 6 + 617 + 20 + 2 + 17 = 666.

40661720217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 40661720217 - 2⁸ = 40661719961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40661720219) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 98216509 + ... + 98216922.

It is an arithmetic number, because the mean of its divisors is an integer number (5107269232).

Almost surely, 2^40661720217 is an apocalyptic number.

It is an amenable number.

40661720217 is a deficient number, since it is larger than the sum of its proper divisors (20625510567).

40661720217 is a wasteful number, since it uses less digits than its factorization.

40661720217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196433460 (or 196433457 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The spelling of 40661720217 in words is "forty billion, six hundred sixty-one million, seven hundred twenty thousand, two hundred seventeen".