61040665 has 16 divisors (see below), whose sum is σ = 83841408. Its totient is φ = 41792256.

The previous prime is 61040657. The next prime is 61040669. The reversal of 61040665 is 56604016.

It is a cyclic number.

It is not a de Polignac number, because 61040665 - 2³ = 61040657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61040669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38529 + ... + 40081.

It is an arithmetic number, because the mean of its divisors is an integer number (5240088).

Almost surely, 2^61040665 is an apocalyptic number.

It is an amenable number.

61040665 is a deficient number, since it is larger than the sum of its proper divisors (22800743).

61040665 is a wasteful number, since it uses less digits than its factorization.

61040665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2688.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 61040665 is about 7812.8525520453. The cubic root of 61040665 is about 393.7371730095.

The spelling of 61040665 in words is "sixty-one million, forty thousand, six hundred sixty-five".