55785161 has 2 divisors, whose sum is σ = 55785162. Its totient is φ = 55785160.

The previous prime is 55785157. The next prime is 55785187. The reversal of 55785161 is 16158755.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29365561 + 26419600 = 5419^2 + 5140^2 .

It is a cyclic number.

It is not a de Polignac number, because 55785161 - 2² = 55785157 is a prime.

It is a super-2 number, since 2×55785161² = 6223968375591842, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55782161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27892580 + 27892581.

It is an arithmetic number, because the mean of its divisors is an integer number (27892581).

Almost surely, 2^55785161 is an apocalyptic number.

It is an amenable number.

55785161 is a deficient number, since it is larger than the sum of its proper divisors (1).

55785161 is an equidigital number, since it uses as much as digits as its factorization.

55785161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42000, while the sum is 38.

The square root of 55785161 is about 7468.9464451153. The cubic root of 55785161 is about 382.0963569139.

The spelling of 55785161 in words is "fifty-five million, seven hundred eighty-five thousand, one hundred sixty-one".