40181621043 has 4 divisors (see below), whose sum is σ = 53575494728. Its totient is φ = 26787747360.

The previous prime is 40181620987. The next prime is 40181621057. The reversal of 40181621043 is 34012618104.

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

It is not a de Polignac number, because 40181621043 - 2⁶ = 40181620979 is a prime.

It is a super-2 number, since 2×40181621043² (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 40181621043.

It is not an unprimeable number, because it can be changed into a prime (40181621063) 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, 6696936838 + ... + 6696936843.

It is an arithmetic number, because the mean of its divisors is an integer number (13393873682).

Almost surely, 2^40181621043 is an apocalyptic number.

40181621043 is a deficient number, since it is larger than the sum of its proper divisors (13393873685).

40181621043 is a wasteful number, since it uses less digits than its factorization.

40181621043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13393873684.

The product of its (nonzero) digits is 4608, while the sum is 30.

The spelling of 40181621043 in words is "forty billion, one hundred eighty-one million, six hundred twenty-one thousand, forty-three".