55561785 has 8 divisors (see below), whose sum is σ = 88898880. Its totient is φ = 29632944.

The previous prime is 55561771. The next prime is 55561787. The reversal of 55561785 is 58716555.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 55561785 - 2¹⁶ = 55496249 is a prime.

It is a super-2 number, since 2×55561785² = 6174223904772450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55561787) 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, 1852045 + ... + 1852074.

It is an arithmetic number, because the mean of its divisors is an integer number (11112360).

Almost surely, 2^55561785 is an apocalyptic number.

It is an amenable number.

55561785 is a deficient number, since it is larger than the sum of its proper divisors (33337095).

55561785 is a wasteful number, since it uses less digits than its factorization.

55561785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3704127.

The product of its digits is 210000, while the sum is 42.

The square root of 55561785 is about 7453.9777971228. The cubic root of 55561785 is about 381.5856755190.

The spelling of 55561785 in words is "fifty-five million, five hundred sixty-one thousand, seven hundred eighty-five".