40973312561 has 4 divisors (see below), whose sum is σ = 41210152692. Its totient is φ = 40736472432.

The previous prime is 40973312537. The next prime is 40973312617. The reversal of 40973312561 is 16521337904.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21581079025 + 19392233536 = 146905^2 + 139256^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40973312561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40973312521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118419806 + ... + 118420151.

It is an arithmetic number, because the mean of its divisors is an integer number (10302538173).

Almost surely, 2^40973312561 is an apocalyptic number.

It is an amenable number.

40973312561 is a deficient number, since it is larger than the sum of its proper divisors (236840131).

40973312561 is a wasteful number, since it uses less digits than its factorization.

40973312561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236840130.

The product of its (nonzero) digits is 136080, while the sum is 41.

The spelling of 40973312561 in words is "forty billion, nine hundred seventy-three million, three hundred twelve thousand, five hundred sixty-one".