71662271220 has 72 divisors (see below), whose sum is σ = 217401780960. Its totient is φ = 19107633600.

The previous prime is 71662271207. The next prime is 71662271231. The reversal of 71662271220 is 2217226617.

It is a happy number.

71662271220 is a `hidden beast` number, since 7 + 1 + 6 + 622 + 7 + 1 + 2 + 20 = 666.

It is a super-2 number, since 2×71662271220² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1898491 + ... + 1935869.

It is an arithmetic number, because the mean of its divisors is an integer number (3019469180).

Almost surely, 2^71662271220 is an apocalyptic number.

It is an amenable number.

71662271220 is an abundant number, since it is smaller than the sum of its proper divisors (145739509740).

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

71662271220 is a wasteful number, since it uses less digits than its factorization.

71662271220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48045 (or 48040 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

Adding to 71662271220 its reverse (2217226617), we get a palindrome (73879497837).

The spelling of 71662271220 in words is "seventy-one billion, six hundred sixty-two million, two hundred seventy-one thousand, two hundred twenty".