71801606421 has 12 divisors (see below), whose sum is σ = 103717962400. Its totient is φ = 47865646440.

The previous prime is 71801606407. The next prime is 71801606473. The reversal of 71801606421 is 12460610817.

It is a happy number.

71801606421 is a `hidden beast` number, since 7 + 1 + 8 + 0 + 1 + 6 + 0 + 642 + 1 = 666.

It is not a de Polignac number, because 71801606421 - 2¹⁴ = 71801590037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71801606491) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59730 + ... + 383628.

Almost surely, 2^71801606421 is an apocalyptic number.

It is an amenable number.

71801606421 is a deficient number, since it is larger than the sum of its proper divisors (31916355979).

71801606421 is a wasteful number, since it uses less digits than its factorization.

71801606421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348536 (or 348533 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The spelling of 71801606421 in words is "seventy-one billion, eight hundred one million, six hundred six thousand, four hundred twenty-one".