55661770 has 16 divisors (see below), whose sum is σ = 101565000. Its totient is φ = 21959424.

The previous prime is 55661747. The next prime is 55661797. The reversal of 55661770 is 7716655.

It can be written as a sum of positive squares in 4 ways, for example, as 47983329 + 7678441 = 6927^2 + 2771^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37395 + ... + 38854.

Almost surely, 2^55661770 is an apocalyptic number.

55661770 is a deficient number, since it is larger than the sum of its proper divisors (45903230).

55661770 is a wasteful number, since it uses less digits than its factorization.

55661770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76329.

The product of its (nonzero) digits is 44100, while the sum is 37.

The square root of 55661770 is about 7460.6816042504. The cubic root of 55661770 is about 381.8144297542.

It can be divided in two parts, 556 and 61770, that added together give a palindrome (62326).

The spelling of 55661770 in words is "fifty-five million, six hundred sixty-one thousand, seven hundred seventy".