61666255 has 32 divisors (see below), whose sum is σ = 88502400. Its totient is φ = 41207040.

The previous prime is 61666211. The next prime is 61666271. The reversal of 61666255 is 55266616.

It is not a de Polignac number, because 61666255 - 2⁹ = 61665743 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 69877 + ... + 70753.

It is an arithmetic number, because the mean of its divisors is an integer number (2765700).

Almost surely, 2^61666255 is an apocalyptic number.

61666255 is a deficient number, since it is larger than the sum of its proper divisors (26836145).

61666255 is an equidigital number, since it uses as much as digits as its factorization.

61666255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 944 (or 930 counting only the distinct ones).

The product of its digits is 64800, while the sum is 37.

The square root of 61666255 is about 7852.7864481342. The cubic root of 61666255 is about 395.0777072990.

It can be divided in two parts, 6166 and 6255, that added together give a palindrome (12421).

The spelling of 61666255 in words is "sixty-one million, six hundred sixty-six thousand, two hundred fifty-five".