40261666 has 4 divisors (see below), whose sum is σ = 60392502. Its totient is φ = 20130832.

The previous prime is 40261651. The next prime is 40261679. The reversal of 40261666 is 66616204.

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., 27092025 + 13169641 = 5205^2 + 3629^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10065415 + ... + 10065418.

Almost surely, 2^40261666 is an apocalyptic number.

40261666 is a deficient number, since it is larger than the sum of its proper divisors (20130836).

40261666 is a wasteful number, since it uses less digits than its factorization.

40261666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20130835.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 40261666 is about 6345.2081132143. The cubic root of 40261666 is about 342.7393067114.

The spelling of 40261666 in words is "forty million, two hundred sixty-one thousand, six hundred sixty-six".