71600661 has 36 divisors (see below), whose sum is σ = 116818156. Its totient is φ = 42197760.

The previous prime is 71600657. The next prime is 71600687. The reversal of 71600661 is 16600617.

It can be written as a sum of positive squares in 2 ways, for example, as 51753636 + 19847025 = 7194^2 + 4455^2 .

It is not a de Polignac number, because 71600661 - 2² = 71600657 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 (71600611) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 39405 + ... + 41181.

Almost surely, 2^71600661 is an apocalyptic number.

It is an amenable number.

71600661 is a deficient number, since it is larger than the sum of its proper divisors (45217495).

71600661 is a wasteful number, since it uses less digits than its factorization.

71600661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1842 (or 1828 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 71600661 is about 8461.7173788776. The cubic root of 71600661 is about 415.2462099270.

The spelling of 71600661 in words is "seventy-one million, six hundred thousand, six hundred sixty-one".