40505369721 has 16 divisors (see below), whose sum is σ = 55090041600. Its totient is φ = 26467129728.

The previous prime is 40505369711. The next prime is 40505369743. The reversal of 40505369721 is 12796350504.

It is not a de Polignac number, because 40505369721 - 2¹¹ = 40505367673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40505369701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 591286 + ... + 656223.

It is an arithmetic number, because the mean of its divisors is an integer number (3443127600).

Almost surely, 2^40505369721 is an apocalyptic number.

It is an amenable number.

40505369721 is a deficient number, since it is larger than the sum of its proper divisors (14584671879).

40505369721 is a wasteful number, since it uses less digits than its factorization.

40505369721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1247728.

The product of its (nonzero) digits is 226800, while the sum is 42.

The spelling of 40505369721 in words is "forty billion, five hundred five million, three hundred sixty-nine thousand, seven hundred twenty-one".