40266561 has 8 divisors (see below), whose sum is σ = 54190944. Its totient is φ = 26593280.

The previous prime is 40266509. The next prime is 40266563. The reversal of 40266561 is 16566204.

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 40266561 - 2⁷ = 40266433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40266563) 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, 62400 + ... + 63041.

It is an arithmetic number, because the mean of its divisors is an integer number (6773868).

Almost surely, 2^40266561 is an apocalyptic number.

It is an amenable number.

40266561 is a deficient number, since it is larger than the sum of its proper divisors (13924383).

40266561 is a wasteful number, since it uses less digits than its factorization.

40266561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125551.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 40266561 is about 6345.5938256400. The cubic root of 40266561 is about 342.7531961922.

The spelling of 40266561 in words is "forty million, two hundred sixty-six thousand, five hundred sixty-one".