71205156656 has 20 divisors (see below), whose sum is σ = 145221043800. Its totient is φ = 33728758272.

The previous prime is 71205156623. The next prime is 71205156697. The reversal of 71205156656 is 65665150217.

It is a super-2 number, since 2×71205156656² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117113441 + ... + 117114048.

It is an arithmetic number, because the mean of its divisors is an integer number (7261052190).

Almost surely, 2^71205156656 is an apocalyptic number.

71205156656 is a gapful number since it is divisible by the number (76) formed by its first and last digit.

It is an amenable number.

71205156656 is an abundant number, since it is smaller than the sum of its proper divisors (74015887144).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71205156656 is a wasteful number, since it uses less digits than its factorization.

71205156656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234227516 (or 234227510 counting only the distinct ones).

The product of its (nonzero) digits is 378000, while the sum is 44.

The spelling of 71205156656 in words is "seventy-one billion, two hundred five million, one hundred fifty-six thousand, six hundred fifty-six".