61508866 has 4 divisors (see below), whose sum is σ = 92263302. Its totient is φ = 30754432.

The previous prime is 61508861. The next prime is 61508891. The reversal of 61508866 is 66880516.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 32661225 + 28847641 = 5715^2 + 5371^2 .

It is not an unprimeable number, because it can be changed into a prime (61508861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15377215 + ... + 15377218.

Almost surely, 2^61508866 is an apocalyptic number.

61508866 is a deficient number, since it is larger than the sum of its proper divisors (30754436).

61508866 is a wasteful number, since it uses less digits than its factorization.

61508866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30754435.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 61508866 is about 7842.7588258214. The cubic root of 61508866 is about 394.7413058034.

The spelling of 61508866 in words is "sixty-one million, five hundred eight thousand, eight hundred sixty-six".