71660121 has 16 divisors (see below), whose sum is σ = 103076736. Its totient is φ = 44021376.

The previous prime is 71660119. The next prime is 71660137. The reversal of 71660121 is 12106617.

It is not a de Polignac number, because 71660121 - 2¹ = 71660119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 71660091 and 71660100.

It is not an unprimeable number, because it can be changed into a prime (71660521) 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, 27741 + ... + 30213.

It is an arithmetic number, because the mean of its divisors is an integer number (6442296).

Almost surely, 2^71660121 is an apocalyptic number.

It is an amenable number.

71660121 is a deficient number, since it is larger than the sum of its proper divisors (31416615).

71660121 is a wasteful number, since it uses less digits than its factorization.

71660121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3232.

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 71660121 is about 8465.2301209122. The cubic root of 71660121 is about 415.3611237084.

Adding to 71660121 its reverse (12106617), we get a palindrome (83766738).

The spelling of 71660121 in words is "seventy-one million, six hundred sixty thousand, one hundred twenty-one".