61601665 has 8 divisors (see below), whose sum is σ = 73972800. Its totient is φ = 49247472.

The previous prime is 61601621. The next prime is 61601711. The reversal of 61601665 is 56610616.

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 61601665 - 2¹⁹ = 61077377 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6036 + ... + 12634.

It is an arithmetic number, because the mean of its divisors is an integer number (9246600).

Almost surely, 2^61601665 is an apocalyptic number.

It is an amenable number.

61601665 is a deficient number, since it is larger than the sum of its proper divisors (12371135).

61601665 is a wasteful number, since it uses less digits than its factorization.

61601665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8471.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 61601665 is about 7848.6728177444. The cubic root of 61601665 is about 394.9397226827.

The spelling of 61601665 in words is "sixty-one million, six hundred one thousand, six hundred sixty-five".