71660651 has 2 divisors, whose sum is σ = 71660652. Its totient is φ = 71660650.

The previous prime is 71660629. The next prime is 71660657. The reversal of 71660651 is 15606617.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71660651 - 2¹⁴ = 71644267 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71660657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35830325 + 35830326.

It is an arithmetic number, because the mean of its divisors is an integer number (35830326).

Almost surely, 2^71660651 is an apocalyptic number.

71660651 is a deficient number, since it is larger than the sum of its proper divisors (1).

71660651 is an equidigital number, since it uses as much as digits as its factorization.

71660651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 71660651 is about 8465.2614253784. The cubic root of 71660651 is about 415.3621477129.

The spelling of 71660651 in words is "seventy-one million, six hundred sixty thousand, six hundred fifty-one".