61500665 has 4 divisors (see below), whose sum is σ = 73800804. Its totient is φ = 49200528.

The previous prime is 61500661. The next prime is 61500671. The reversal of 61500665 is 56600516.

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

It can be written as a sum of positive squares in 2 ways, for example, as 33790969 + 27709696 = 5813^2 + 5264^2 .

It is a cyclic number.

It is not a de Polignac number, because 61500665 - 2² = 61500661 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61500661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6150062 + ... + 6150071.

It is an arithmetic number, because the mean of its divisors is an integer number (18450201).

Almost surely, 2^61500665 is an apocalyptic number.

It is an amenable number.

61500665 is a deficient number, since it is larger than the sum of its proper divisors (12300139).

61500665 is a wasteful number, since it uses less digits than its factorization.

61500665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12300138.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 61500665 is about 7842.2359694159. The cubic root of 61500665 is about 394.7237613552.

The spelling of 61500665 in words is "sixty-one million, five hundred thousand, six hundred sixty-five".