40345760781 has 24 divisors (see below), whose sum is σ = 58467505824. Its totient is φ = 26809463520.

The previous prime is 40345760761. The next prime is 40345760789. The reversal of 40345760781 is 18706754304.

40345760781 is a `hidden beast` number, since 4 + 0 + 3 + 4 + 576 + 0 + 78 + 1 = 666.

It is not a de Polignac number, because 40345760781 - 2⁹ = 40345760269 is a prime.

It is a super-2 number, since 2×40345760781² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40345760789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4948150 + ... + 4956296.

It is an arithmetic number, because the mean of its divisors is an integer number (2436146076).

Almost surely, 2^40345760781 is an apocalyptic number.

It is an amenable number.

40345760781 is a deficient number, since it is larger than the sum of its proper divisors (18121745043).

40345760781 is a wasteful number, since it uses less digits than its factorization.

40345760781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9881 (or 9878 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 45.

The spelling of 40345760781 in words is "forty billion, three hundred forty-five million, seven hundred sixty thousand, seven hundred eighty-one".