40660681 has 4 divisors (see below), whose sum is σ = 41063364. Its totient is φ = 40258000.

The previous prime is 40660679. The next prime is 40660691. The reversal of 40660681 is 18606604.

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

It can be written as a sum of positive squares in 2 ways, for example, as 39879225 + 781456 = 6315^2 + 884^2 .

It is a cyclic number.

It is not a de Polignac number, because 40660681 - 2¹ = 40660679 is a prime.

It is a super-2 number, since 2×40660681² = 3306581958767522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40660691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 201190 + ... + 201391.

It is an arithmetic number, because the mean of its divisors is an integer number (10265841).

Almost surely, 2^40660681 is an apocalyptic number.

It is an amenable number.

40660681 is a deficient number, since it is larger than the sum of its proper divisors (402683).

40660681 is a wasteful number, since it uses less digits than its factorization.

40660681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402682.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 40660681 is about 6376.5728255859. The cubic root of 40660681 is about 343.8678310762.

The spelling of 40660681 in words is "forty million, six hundred sixty thousand, six hundred eighty-one".