905563661 has 8 divisors (see below), whose sum is σ = 939675648. Its totient is φ = 871758000.

The previous prime is 905563651. The next prime is 905563663. The reversal of 905563661 is 166365509.

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 905563661 - 2¹⁸ = 905301517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (905563663) 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, 70550 + ... + 82391.

It is an arithmetic number, because the mean of its divisors is an integer number (117459456).

Almost surely, 2^905563661 is an apocalyptic number.

It is an amenable number.

905563661 is a deficient number, since it is larger than the sum of its proper divisors (34111987).

905563661 is a wasteful number, since it uses less digits than its factorization.

905563661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153163.

The product of its (nonzero) digits is 145800, while the sum is 41.

The square root of 905563661 is about 30092.5848175261. The cubic root of 905563661 is about 967.4748011162.

The spelling of 905563661 in words is "nine hundred five million, five hundred sixty-three thousand, six hundred sixty-one".