56661101 has 18 divisors (see below), whose sum is σ = 67192398. Its totient is φ = 47636400.

The previous prime is 56661079. The next prime is 56661107. The reversal of 56661101 is 10116665.

It can be written as a sum of positive squares in only one way, i.e., 56100100 + 561001 = 7490^2 + 749^2 .

It is not a de Polignac number, because 56661101 - 2¹⁰ = 56660077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56661107) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 529490 + ... + 529596.

It is an arithmetic number, because the mean of its divisors is an integer number (3732911).

Almost surely, 2^56661101 is an apocalyptic number.

It is an amenable number.

56661101 is a deficient number, since it is larger than the sum of its proper divisors (10531297).

56661101 is a wasteful number, since it uses less digits than its factorization.

56661101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329 (or 215 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 56661101 is about 7527.3568402195. The cubic root of 56661101 is about 384.0858753433.

Adding to 56661101 its reverse (10116665), we get a palindrome (66777766).

The spelling of 56661101 in words is "fifty-six million, six hundred sixty-one thousand, one hundred one".