40445721781 has 8 divisors (see below), whose sum is σ = 42580490720. Its totient is φ = 38311557552.

The previous prime is 40445721761. The next prime is 40445721821. The reversal of 40445721781 is 18712754404.

40445721781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40445721781 - 2¹⁹ = 40445197493 is a prime.

It is a super-2 number, since 2×40445721781² (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 (40445721761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10515 + ... + 284608.

It is an arithmetic number, because the mean of its divisors is an integer number (5322561340).

Almost surely, 2^40445721781 is an apocalyptic number.

It is an amenable number.

40445721781 is a deficient number, since it is larger than the sum of its proper divisors (2134768939).

40445721781 is a wasteful number, since it uses less digits than its factorization.

40445721781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302355.

The product of its (nonzero) digits is 250880, while the sum is 43.

The spelling of 40445721781 in words is "forty billion, four hundred forty-five million, seven hundred twenty-one thousand, seven hundred eighty-one".