61550666 has 4 divisors (see below), whose sum is σ = 92326002. Its totient is φ = 30775332.

The previous prime is 61550663. The next prime is 61550669. The reversal of 61550666 is 66605516.

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

It is an interprime number because it is at equal distance from previous prime (61550663) and next prime (61550669).

It can be written as a sum of positive squares in only one way, i.e., 34562641 + 26988025 = 5879^2 + 5195^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61550663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15387665 + ... + 15387668.

Almost surely, 2^61550666 is an apocalyptic number.

61550666 is a deficient number, since it is larger than the sum of its proper divisors (30775336).

61550666 is a wasteful number, since it uses less digits than its factorization.

61550666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30775335.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 61550666 is about 7845.4232518074. The cubic root of 61550666 is about 394.8307045701.

The spelling of 61550666 in words is "sixty-one million, five hundred fifty thousand, six hundred sixty-six".