40202216081 has 4 divisors (see below), whose sum is σ = 40203477732. Its totient is φ = 40200954432.

The previous prime is 40202216057. The next prime is 40202216099. The reversal of 40202216081 is 18061220204.

It is a happy number.

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 8092801600 + 32109414481 = 89960^2 + 179191^2 .

It is a cyclic number.

It is not a de Polignac number, because 40202216081 - 2⁶ = 40202216017 is a prime.

It is a super-2 number, since 2×40202216081² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40202216081.

It is not an unprimeable number, because it can be changed into a prime (40202216881) 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, 581756 + ... + 647181.

It is an arithmetic number, because the mean of its divisors is an integer number (10050869433).

Almost surely, 2^40202216081 is an apocalyptic number.

It is an amenable number.

40202216081 is a deficient number, since it is larger than the sum of its proper divisors (1261651).

40202216081 is a wasteful number, since it uses less digits than its factorization.

40202216081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1261650.

The product of its (nonzero) digits is 1536, while the sum is 26.

Adding to 40202216081 its reverse (18061220204), we get a palindrome (58263436285).

The spelling of 40202216081 in words is "forty billion, two hundred two million, two hundred sixteen thousand, eighty-one".