61600661 has 4 divisors (see below), whose sum is σ = 62644800. Its totient is φ = 60556524.

The previous prime is 61600657. The next prime is 61600699. The reversal of 61600661 is 16600616.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61600661 - 2² = 61600657 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61600661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61600631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 521981 + ... + 522098.

It is an arithmetic number, because the mean of its divisors is an integer number (15661200).

Almost surely, 2^61600661 is an apocalyptic number.

It is an amenable number.

61600661 is a deficient number, since it is larger than the sum of its proper divisors (1044139).

61600661 is a wasteful number, since it uses less digits than its factorization.

61600661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1044138.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 61600661 is about 7848.6088576257. The cubic root of 61600661 is about 394.9375770608.

The spelling of 61600661 in words is "sixty-one million, six hundred thousand, six hundred sixty-one".