40881257866 has 4 divisors (see below), whose sum is σ = 61321886802. Its totient is φ = 20440628932.

The previous prime is 40881257849. The next prime is 40881257867. The reversal of 40881257866 is 66875218804.

40881257866 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., 24925778641 + 15955479225 = 157879^2 + 126315^2 .

It is not an unprimeable number, because it can be changed into a prime (40881257867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10220314465 + ... + 10220314468.

Almost surely, 2^40881257866 is an apocalyptic number.

40881257866 is a deficient number, since it is larger than the sum of its proper divisors (20440628936).

40881257866 is a wasteful number, since it uses less digits than its factorization.

40881257866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20440628935.

The product of its (nonzero) digits is 5160960, while the sum is 55.

The spelling of 40881257866 in words is "forty billion, eight hundred eighty-one million, two hundred fifty-seven thousand, eight hundred sixty-six".