71111666121 has 8 divisors (see below), whose sum is σ = 97128129504. Its totient is φ = 46251490080.

The previous prime is 71111666107. The next prime is 71111666123. The reversal of 71111666121 is 12166611117.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 71111666121 - 2⁶ = 71111666057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71111666123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 289071691 + ... + 289071936.

It is an arithmetic number, because the mean of its divisors is an integer number (12141016188).

Almost surely, 2^71111666121 is an apocalyptic number.

It is an amenable number.

71111666121 is a deficient number, since it is larger than the sum of its proper divisors (26016463383).

71111666121 is a wasteful number, since it uses less digits than its factorization.

71111666121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578143671.

The product of its digits is 3024, while the sum is 33.

The spelling of 71111666121 in words is "seventy-one billion, one hundred eleven million, six hundred sixty-six thousand, one hundred twenty-one".