40201517561 has 4 divisors (see below), whose sum is σ = 40301771124. Its totient is φ = 40101264000.

The previous prime is 40201517507. The next prime is 40201517597. The reversal of 40201517561 is 16571510204.

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 33900174400 + 6301343161 = 184120^2 + 79381^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40201517561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40201517861) 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, 50126180 + ... + 50126981.

It is an arithmetic number, because the mean of its divisors is an integer number (10075442781).

Almost surely, 2^40201517561 is an apocalyptic number.

It is an amenable number.

40201517561 is a deficient number, since it is larger than the sum of its proper divisors (100253563).

40201517561 is a wasteful number, since it uses less digits than its factorization.

40201517561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100253562.

The product of its (nonzero) digits is 8400, while the sum is 32.

The spelling of 40201517561 in words is "forty billion, two hundred one million, five hundred seventeen thousand, five hundred sixty-one".