71567661 has 16 divisors (see below), whose sum is σ = 109578240. Its totient is φ = 41091120.

The previous prime is 71567653. The next prime is 71567677. The reversal of 71567661 is 16676517.

It is not a de Polignac number, because 71567661 - 2³ = 71567653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71567641) 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, 56445 + ... + 57698.

It is an arithmetic number, because the mean of its divisors is an integer number (6848640).

Almost surely, 2^71567661 is an apocalyptic number.

It is an amenable number.

71567661 is a deficient number, since it is larger than the sum of its proper divisors (38010579).

71567661 is a wasteful number, since it uses less digits than its factorization.

71567661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114176.

The product of its digits is 52920, while the sum is 39.

The square root of 71567661 is about 8459.7671953784. The cubic root of 71567661 is about 415.1824059039.

The spelling of 71567661 in words is "seventy-one million, five hundred sixty-seven thousand, six hundred sixty-one".