40115785578 has 48 divisors (see below), whose sum is σ = 90239384928. Its totient is φ = 11873584800.

The previous prime is 40115785421. The next prime is 40115785583. The reversal of 40115785578 is 87558751104.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 40115785578.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 611293 + ... + 673728.

It is an arithmetic number, because the mean of its divisors is an integer number (1879987186).

Almost surely, 2^40115785578 is an apocalyptic number.

40115785578 is an abundant number, since it is smaller than the sum of its proper divisors (50123599350).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40115785578 is a wasteful number, since it uses less digits than its factorization.

40115785578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1285091 (or 1285080 counting only the distinct ones).

The product of its (nonzero) digits is 1568000, while the sum is 51.

The spelling of 40115785578 in words is "forty billion, one hundred fifteen million, seven hundred eighty-five thousand, five hundred seventy-eight".