40667661 has 12 divisors (see below), whose sum is σ = 58799520. Its totient is φ = 27085320.

The previous prime is 40667651. The next prime is 40667677. The reversal of 40667661 is 16676604.

It is not a de Polignac number, because 40667661 - 2⁷ = 40667533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40667651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13176 + ... + 15966.

It is an arithmetic number, because the mean of its divisors is an integer number (4899960).

Almost surely, 2^40667661 is an apocalyptic number.

It is an amenable number.

40667661 is a deficient number, since it is larger than the sum of its proper divisors (18131859).

40667661 is a wasteful number, since it uses less digits than its factorization.

40667661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4416 (or 4413 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 40667661 is about 6377.1201180470. The cubic root of 40667661 is about 343.8875065962.

It can be divided in two parts, 40667 and 661, that added together give a triangular number (41328 = T₂₈₇).

The spelling of 40667661 in words is "forty million, six hundred sixty-seven thousand, six hundred sixty-one".