71839098991 has 8 divisors (see below), whose sum is σ = 78373008000. Its totient is φ = 65305703640.

The previous prime is 71839098977. The next prime is 71839099061. The reversal of 71839098991 is 19989093817.

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

It is a cyclic number.

It is not a de Polignac number, because 71839098991 - 2³³ = 63249164399 is a prime.

It is a super-2 number, since 2×71839098991² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71839098901) 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, 200710 + ... + 428908.

It is an arithmetic number, because the mean of its divisors is an integer number (9796626000).

Almost surely, 2^71839098991 is an apocalyptic number.

71839098991 is a deficient number, since it is larger than the sum of its proper divisors (6533909009).

71839098991 is a wasteful number, since it uses less digits than its factorization.

71839098991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256829.

The product of its (nonzero) digits is 8817984, while the sum is 64.

The spelling of 71839098991 in words is "seventy-one billion, eight hundred thirty-nine million, ninety-eight thousand, nine hundred ninety-one".