55707661 has 12 divisors (see below), whose sum is σ = 58026496. Its totient is φ = 53449200.

The previous prime is 55707649. The next prime is 55707683. The reversal of 55707661 is 16670755.

It is not a de Polignac number, because 55707661 - 2⁹ = 55707149 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55707661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55707761) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 438580 + ... + 438706.

Almost surely, 2^55707661 is an apocalyptic number.

It is an amenable number.

55707661 is a deficient number, since it is larger than the sum of its proper divisors (2318835).

55707661 is a wasteful number, since it uses less digits than its factorization.

55707661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372 (or 271 counting only the distinct ones).

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

The square root of 55707661 is about 7463.7564938843. The cubic root of 55707661 is about 381.9193313940.

It can be divided in two parts, 5570 and 7661, that added together give a palindrome (13231).

The spelling of 55707661 in words is "fifty-five million, seven hundred seven thousand, six hundred sixty-one".