71021616601 has 16 divisors (see below), whose sum is σ = 81051658128. Its totient is φ = 61650432000.

The previous prime is 71021616593. The next prime is 71021616641. The reversal of 71021616601 is 10661612017.

It can be written as a sum of positive squares in 8 ways, for example, as 31520451600 + 39501165001 = 177540^2 + 198749^2 .

It is not a de Polignac number, because 71021616601 - 2³ = 71021616593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71021616641) 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, 131631 + ... + 399211.

It is an arithmetic number, because the mean of its divisors is an integer number (5065728633).

Almost surely, 2^71021616601 is an apocalyptic number.

It is an amenable number.

71021616601 is a deficient number, since it is larger than the sum of its proper divisors (10030041527).

71021616601 is a wasteful number, since it uses less digits than its factorization.

71021616601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268812.

The product of its (nonzero) digits is 3024, while the sum is 31.

The spelling of 71021616601 in words is "seventy-one billion, twenty-one million, six hundred sixteen thousand, six hundred one".