40432171665 has 32 divisors (see below), whose sum is σ = 68126889600. Its totient is φ = 20419706880.

The previous prime is 40432171651. The next prime is 40432171667. The reversal of 40432171665 is 56617123404.

It is a happy number.

It is not a de Polignac number, because 40432171665 - 2⁴ = 40432171649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40432171667) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 627345 + ... + 688785.

It is an arithmetic number, because the mean of its divisors is an integer number (2128965300).

Almost surely, 2^40432171665 is an apocalyptic number.

It is an amenable number.

40432171665 is a deficient number, since it is larger than the sum of its proper divisors (27694717935).

40432171665 is a wasteful number, since it uses less digits than its factorization.

40432171665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63777.

The product of its (nonzero) digits is 120960, while the sum is 39.

The spelling of 40432171665 in words is "forty billion, four hundred thirty-two million, one hundred seventy-one thousand, six hundred sixty-five".