1616221525320 has 96 divisors (see below), whose sum is σ = 5304727204920. Its totient is φ = 426725145600.

The previous prime is 1616221525313. The next prime is 1616221525337. The reversal of 1616221525320 is 235251226161.

1616221525320 is a `hidden beast` number, since 1 + 6 + 1 + 622 + 1 + 5 + 2 + 5 + 3 + 20 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1548247649796 + 67973875524 = 1244286^2 + 260718^2 .

It is a super-2 number, since 2×1616221525320² (a number of 25 digits) contains 22 as substring.

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

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, 22188909 + ... + 22261628.

Almost surely, 2^{1616221525320} is an apocalyptic number.

1616221525320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1616221525320 is an abundant number, since it is smaller than the sum of its proper divisors (3688505679600).

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

1616221525320 is a wasteful number, since it uses less digits than its factorization.

1616221525320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44450655 (or 44450648 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The spelling of 1616221525320 in words is "one trillion, six hundred sixteen billion, two hundred twenty-one million, five hundred twenty-five thousand, three hundred twenty".