61516666 has 4 divisors (see below), whose sum is σ = 92275002. Its totient is φ = 30758332.

The previous prime is 61516649. The next prime is 61516667. The reversal of 61516666 is 66661516.

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., 48011041 + 13505625 = 6929^2 + 3675^2 .

It is not an unprimeable number, because it can be changed into a prime (61516667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15379165 + ... + 15379168.

Almost surely, 2^61516666 is an apocalyptic number.

61516666 is a deficient number, since it is larger than the sum of its proper divisors (30758336).

61516666 is a wasteful number, since it uses less digits than its factorization.

61516666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30758335.

The product of its digits is 38880, while the sum is 37.

The square root of 61516666 is about 7843.2560840508. The cubic root of 61516666 is about 394.7579909430.

The spelling of 61516666 in words is "sixty-one million, five hundred sixteen thousand, six hundred sixty-six".