40661665971 has 16 divisors (see below), whose sum is σ = 54575798784. Its totient is φ = 26927750304.

The previous prime is 40661665949. The next prime is 40661665987. The reversal of 40661665971 is 17956616604.

It is not a de Polignac number, because 40661665971 - 2¹⁰ = 40661664947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40661665921) 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, 2120790 + ... + 2139876.

It is an arithmetic number, because the mean of its divisors is an integer number (3410987424).

Almost surely, 2^40661665971 is an apocalyptic number.

40661665971 is a deficient number, since it is larger than the sum of its proper divisors (13914132813).

40661665971 is a wasteful number, since it uses less digits than its factorization.

40661665971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23770.

The product of its (nonzero) digits is 1632960, while the sum is 51.

The spelling of 40661665971 in words is "forty billion, six hundred sixty-one million, six hundred sixty-five thousand, nine hundred seventy-one".