40721035665 has 16 divisors (see below), whose sum is σ = 65156976000. Its totient is φ = 21716779392.

The previous prime is 40721035639. The next prime is 40721035681. The reversal of 40721035665 is 56653012704.

40721035665 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 40721035665 - 2¹⁸ = 40720773521 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 298036 + ... + 412634.

It is an arithmetic number, because the mean of its divisors is an integer number (4072311000).

Almost surely, 2^40721035665 is an apocalyptic number.

It is an amenable number.

40721035665 is a deficient number, since it is larger than the sum of its proper divisors (24435940335).

40721035665 is a wasteful number, since it uses less digits than its factorization.

40721035665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138296.

The product of its (nonzero) digits is 151200, while the sum is 39.

The spelling of 40721035665 in words is "forty billion, seven hundred twenty-one million, thirty-five thousand, six hundred sixty-five".