71720002123 has 16 divisors (see below), whose sum is σ = 89432098560. Its totient is φ = 55876370400.

The previous prime is 71720002121. The next prime is 71720002127. The reversal of 71720002123 is 32120002717.

It is a cyclic number.

It is not a de Polignac number, because 71720002123 - 2¹ = 71720002121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71720002121) 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, 404868 + ... + 554398.

It is an arithmetic number, because the mean of its divisors is an integer number (5589506160).

Almost surely, 2^71720002123 is an apocalyptic number.

71720002123 is a deficient number, since it is larger than the sum of its proper divisors (17712096437).

71720002123 is a wasteful number, since it uses less digits than its factorization.

71720002123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155778.

The product of its (nonzero) digits is 1176, while the sum is 25.

The spelling of 71720002123 in words is "seventy-one billion, seven hundred twenty million, two thousand, one hundred twenty-three".