41156643978 has 24 divisors (see below), whose sum is σ = 90174672900. Its totient is φ = 13564736064.

The previous prime is 41156643977. The next prime is 41156644091. The reversal of 41156643978 is 87934665114.

41156643978 is a `hidden beast` number, since 4 + 1 + 1 + 566 + 4 + 3 + 9 + 78 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 39801447009 + 1355196969 = 199503^2 + 36813^2 .

It is not an unprimeable number, because it can be changed into a prime (41156643977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12843793 + ... + 12846996.

Almost surely, 2^41156643978 is an apocalyptic number.

41156643978 is an abundant number, since it is smaller than the sum of its proper divisors (49018028922).

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

41156643978 is a wasteful number, since it uses less digits than its factorization.

41156643978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25690886 (or 25690883 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 54.

The spelling of 41156643978 in words is "forty-one billion, one hundred fifty-six million, six hundred forty-three thousand, nine hundred seventy-eight".