40166555681 has 8 divisors (see below), whose sum is σ = 46186259904. Its totient is φ = 34217257680.

The previous prime is 40166555659. The next prime is 40166555687. The reversal of 40166555681 is 18655566104.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40166555681 - 2¹⁴ = 40166539297 is a prime.

It is a super-2 number, since 2×40166555681² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40166555687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17600330 + ... + 17602611.

It is an arithmetic number, because the mean of its divisors is an integer number (5773282488).

Almost surely, 2^40166555681 is an apocalyptic number.

It is an amenable number.

40166555681 is a deficient number, since it is larger than the sum of its proper divisors (6019704223).

40166555681 is a wasteful number, since it uses less digits than its factorization.

40166555681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35203111.

The product of its (nonzero) digits is 864000, while the sum is 47.

The spelling of 40166555681 in words is "forty billion, one hundred sixty-six million, five hundred fifty-five thousand, six hundred eighty-one".