61156660 has 12 divisors (see below), whose sum is σ = 128429028. Its totient is φ = 24462656.

The previous prime is 61156643. The next prime is 61156703. The reversal of 61156660 is 6665116.

61156660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 12659364 + 48497296 = 3558^2 + 6964^2 .

It is a congruent number.

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, 1528897 + ... + 1528936.

It is an arithmetic number, because the mean of its divisors is an integer number (10702419).

Almost surely, 2^61156660 is an apocalyptic number.

It is an amenable number.

61156660 is an abundant number, since it is smaller than the sum of its proper divisors (67272368).

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

61156660 is a wasteful number, since it uses less digits than its factorization.

61156660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3057842 (or 3057840 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 61156660 is about 7820.2723737732. The cubic root of 61156660 is about 393.9864202076.

It can be divided in two parts, 61156 and 660, that added together give a palindrome (61816).

The spelling of 61156660 in words is "sixty-one million, one hundred fifty-six thousand, six hundred sixty".