55809661 has 8 divisors (see below), whose sum is σ = 58316544. Its totient is φ = 53309520.

The previous prime is 55809643. The next prime is 55809667. The reversal of 55809661 is 16690855.

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 55809661 - 2¹¹ = 55807613 is a prime.

It is a super-2 number, since 2×55809661² = 6229436521869842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55809667) 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, 23260 + ... + 25546.

It is an arithmetic number, because the mean of its divisors is an integer number (7289568).

Almost surely, 2^55809661 is an apocalyptic number.

It is an amenable number.

55809661 is a deficient number, since it is larger than the sum of its proper divisors (2506883).

55809661 is a wasteful number, since it uses less digits than its factorization.

55809661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3371.

The product of its (nonzero) digits is 64800, while the sum is 40.

The square root of 55809661 is about 7470.5863893004. The cubic root of 55809661 is about 382.1522857096.

The spelling of 55809661 in words is "fifty-five million, eight hundred nine thousand, six hundred sixty-one".