40521663 has 24 divisors (see below), whose sum is σ = 72039968. Its totient is φ = 21373632.

The previous prime is 40521647. The next prime is 40521673. The reversal of 40521663 is 36612504.

It is not a de Polignac number, because 40521663 - 2⁴ = 40521647 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40521673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23920 + ... + 25557.

Almost surely, 2^40521663 is an apocalyptic number.

40521663 is a deficient number, since it is larger than the sum of its proper divisors (31518305).

40521663 is a wasteful number, since it uses less digits than its factorization.

40521663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49503 (or 49500 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 40521663 is about 6365.6628091661. The cubic root of 40521663 is about 343.4754913452.

It can be divided in two parts, 4052166 and 3, that added together give a square (4052169 = 2013²).

The spelling of 40521663 in words is "forty million, five hundred twenty-one thousand, six hundred sixty-three".