61603866 has 12 divisors (see below), whose sum is σ = 133475082. Its totient is φ = 20534616.

The previous prime is 61603849. The next prime is 61603873. The reversal of 61603866 is 66830616.

61603866 is a `hidden beast` number, since 616 + 0 + 38 + 6 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 43837641 + 17766225 = 6621^2 + 4215^2 .

It is a super-2 number, since 2×61603866² = 7590072612291912, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61603866.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1711201 + ... + 1711236.

Almost surely, 2^61603866 is an apocalyptic number.

61603866 is an abundant number, since it is smaller than the sum of its proper divisors (71871216).

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

61603866 is a wasteful number, since it uses less digits than its factorization.

61603866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3422445 (or 3422442 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 61603866 is about 7848.8130312806. The cubic root of 61603866 is about 394.9444263000.

The spelling of 61603866 in words is "sixty-one million, six hundred three thousand, eight hundred sixty-six".