61640066 has 16 divisors (see below), whose sum is σ = 98563200. Its totient is φ = 28826928.

The previous prime is 61640057. The next prime is 61640071. The reversal of 61640066 is 66004616.

It is a Curzon number.

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, 7265 + ... + 13268.

It is an arithmetic number, because the mean of its divisors is an integer number (6160200).

Almost surely, 2^61640066 is an apocalyptic number.

61640066 is a deficient number, since it is larger than the sum of its proper divisors (36923134).

61640066 is a wasteful number, since it uses less digits than its factorization.

61640066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20633.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 61640066 is about 7851.1187737800. The cubic root of 61640066 is about 395.0217709519.

The spelling of 61640066 in words is "sixty-one million, six hundred forty thousand, sixty-six".