40851851638 has 16 divisors (see below), whose sum is σ = 66895448256. Its totient is φ = 18596416320.

The previous prime is 40851851633. The next prime is 40851851647. The reversal of 40851851638 is 83615815804.

It is a junction number, because it is equal to n+sod(n) for n = 40851851591 and 40851851600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40851851633) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 10759918 + ... + 10763713.

It is an arithmetic number, because the mean of its divisors is an integer number (4180965516).

Almost surely, 2^40851851638 is an apocalyptic number.

40851851638 is a deficient number, since it is larger than the sum of its proper divisors (26043596618).

40851851638 is a wasteful number, since it uses less digits than its factorization.

40851851638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21523719.

The product of its (nonzero) digits is 921600, while the sum is 49.

The spelling of 40851851638 in words is "forty billion, eight hundred fifty-one million, eight hundred fifty-one thousand, six hundred thirty-eight".