61518661 has 8 divisors (see below), whose sum is σ = 62484800. Its totient is φ = 60559488.

The previous prime is 61518659. The next prime is 61518671. The reversal of 61518661 is 16681516.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61518661 - 2¹ = 61518659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61518641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17710 + ... + 20896.

It is an arithmetic number, because the mean of its divisors is an integer number (7810600).

Almost surely, 2^61518661 is an apocalyptic number.

It is an amenable number.

61518661 is a deficient number, since it is larger than the sum of its proper divisors (966139).

61518661 is a wasteful number, since it uses less digits than its factorization.

61518661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3483.

The product of its digits is 8640, while the sum is 34.

The square root of 61518661 is about 7843.3832623429. The cubic root of 61518661 is about 394.7622582618.

The spelling of 61518661 in words is "sixty-one million, five hundred eighteen thousand, six hundred sixty-one".