61660172 has 12 divisors (see below), whose sum is σ = 123320400. Its totient is φ = 26425776.

The previous prime is 61660127. The next prime is 61660189. The reversal of 61660172 is 27106616.

61660172 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

61660172 is an admirable number.

It is a super-2 number, since 2×61660172² = 7603953622139168, which contains 22 as substring.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1101047 + ... + 1101102.

It is an arithmetic number, because the mean of its divisors is an integer number (10276700).

Almost surely, 2^61660172 is an apocalyptic number.

It is an amenable number.

61660172 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61660172 is a wasteful number, since it uses less digits than its factorization.

61660172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2202160 (or 2202158 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 61660172 is about 7852.3991238347. The cubic root of 61660172 is about 395.0647162030.

Adding to 61660172 its reverse (27106616), we get a palindrome (88766788).

The spelling of 61660172 in words is "sixty-one million, six hundred sixty thousand, one hundred seventy-two".