1721271272616 has 48 divisors (see below), whose sum is σ = 5327744416800. Its totient is φ = 491791792032.

The previous prime is 1721271272557. The next prime is 1721271272629. The reversal of 1721271272616 is 6162721721271.

It is a happy number.

1721271272616 is a `hidden beast` number, since 1 + 7 + 2 + 1 + 2 + 7 + 1 + 27 + 2 + 616 = 666.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1707609886 + ... + 1707610893.

It is an arithmetic number, because the mean of its divisors is an integer number (110994675350).

Almost surely, 2^{1721271272616} is an apocalyptic number.

It is an amenable number.

1721271272616 is an abundant number, since it is smaller than the sum of its proper divisors (3606473144184).

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

1721271272616 is a wasteful number, since it uses less digits than its factorization.

1721271272616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3415220798 (or 3415220791 counting only the distinct ones).

The product of its digits is 197568, while the sum is 45.

Adding to 1721271272616 its reverse (6162721721271), we get a palindrome (7883992993887).

The spelling of 1721271272616 in words is "one trillion, seven hundred twenty-one billion, two hundred seventy-one million, two hundred seventy-two thousand, six hundred sixteen".