40880720581 has 4 divisors (see below), whose sum is σ = 40881154464. Its totient is φ = 40880286700.

The previous prime is 40880720579. The next prime is 40880720593. The reversal of 40880720581 is 18502708804.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 40880720581 - 2¹ = 40880720579 is a prime.

It is a super-2 number, since 2×40880720581² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40880720501) 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, 9475 + ... + 286096.

It is an arithmetic number, because the mean of its divisors is an integer number (10220288616).

Almost surely, 2^40880720581 is an apocalyptic number.

It is an amenable number.

40880720581 is a deficient number, since it is larger than the sum of its proper divisors (433883).

40880720581 is a wasteful number, since it uses less digits than its factorization.

40880720581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433882.

The product of its (nonzero) digits is 143360, while the sum is 43.

The spelling of 40880720581 in words is "forty billion, eight hundred eighty million, seven hundred twenty thousand, five hundred eighty-one".