61866375 has 48 divisors (see below), whose sum is σ = 108886752. Its totient is φ = 31190400.

The previous prime is 61866341. The next prime is 61866377. The reversal of 61866375 is 57366816.

It is not a de Polignac number, because 61866375 - 2¹² = 61862279 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61866377) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 135147 + ... + 135603.

It is an arithmetic number, because the mean of its divisors is an integer number (2268474).

Almost surely, 2^61866375 is an apocalyptic number.

61866375 is a deficient number, since it is larger than the sum of its proper divisors (47020377).

61866375 is a wasteful number, since it uses less digits than its factorization.

61866375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513 (or 484 counting only the distinct ones).

The product of its digits is 181440, while the sum is 42.

The square root of 61866375 is about 7865.5181011806. The cubic root of 61866375 is about 395.5046159832.

It can be divided in two parts, 6186 and 6375, that added together give a triangular number (12561 = T₁₅₈).

The spelling of 61866375 in words is "sixty-one million, eight hundred sixty-six thousand, three hundred seventy-five".