40163451778 has 4 divisors (see below), whose sum is σ = 60245177670. Its totient is φ = 20081725888.

The previous prime is 40163451763. The next prime is 40163451787. The reversal of 40163451778 is 87715436104.

40163451778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 25146664929 + 15016786849 = 158577^2 + 122543^2 .

It is a super-3 number, since 3×40163451778³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10040862943 + ... + 10040862946.

Almost surely, 2^40163451778 is an apocalyptic number.

40163451778 is a deficient number, since it is larger than the sum of its proper divisors (20081725892).

40163451778 is a wasteful number, since it uses less digits than its factorization.

40163451778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20081725891.

The product of its (nonzero) digits is 564480, while the sum is 46.

The spelling of 40163451778 in words is "forty billion, one hundred sixty-three million, four hundred fifty-one thousand, seven hundred seventy-eight".