71998447579 has 4 divisors (see below), whose sum is σ = 71999000640. Its totient is φ = 71997894520.

The previous prime is 71998447537. The next prime is 71998447607. The reversal of 71998447579 is 97574489917.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 71998447579 - 2³⁵ = 37638709211 is a prime.

It is a super-2 number, since 2×71998447579² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71998447679) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37974 + ... + 381364.

It is an arithmetic number, because the mean of its divisors is an integer number (17999750160).

Almost surely, 2^71998447579 is an apocalyptic number.

71998447579 is a deficient number, since it is larger than the sum of its proper divisors (553061).

71998447579 is a wasteful number, since it uses less digits than its factorization.

71998447579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553060.

The product of its digits is 160030080, while the sum is 70.

The spelling of 71998447579 in words is "seventy-one billion, nine hundred ninety-eight million, four hundred forty-seven thousand, five hundred seventy-nine".