40688623845 has 24 divisors (see below), whose sum is σ = 70650941400. Its totient is φ = 21662447616.

The previous prime is 40688623841. The next prime is 40688623879. The reversal of 40688623845 is 54832688604.

40688623845 is a `hidden beast` number, since 4 + 0 + 6 + 8 + 8 + 623 + 8 + 4 + 5 = 666.

40688623845 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1224020196 + 39464603649 = 34986^2 + 198657^2 .

It is not a de Polignac number, because 40688623845 - 2² = 40688623841 is a prime.

It is a super-2 number, since 2×40688623845² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 40688623791 and 40688623800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40688623841) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 768940 + ... + 820149.

It is an arithmetic number, because the mean of its divisors is an integer number (2943789225).

Almost surely, 2^40688623845 is an apocalyptic number.

40688623845 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

40688623845 is a deficient number, since it is larger than the sum of its proper divisors (29962317555).

40688623845 is a wasteful number, since it uses less digits than its factorization.

40688623845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1589669 (or 1589666 counting only the distinct ones).

The product of its (nonzero) digits is 8847360, while the sum is 54.

The spelling of 40688623845 in words is "forty billion, six hundred eighty-eight million, six hundred twenty-three thousand, eight hundred forty-five".