1620104116520 has 32 divisors (see below), whose sum is σ = 3660359737320. Its totient is φ = 645352673280.

The previous prime is 1620104116487. The next prime is 1620104116537. The reversal of 1620104116520 is 256114010261.

It can be written as a sum of positive squares in 4 ways, for example, as 1454469768196 + 165634348324 = 1206014^2 + 406982^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84020657 + ... + 84039936.

Almost surely, 2^{1620104116520} is an apocalyptic number.

1620104116520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1620104116520 is an abundant number, since it is smaller than the sum of its proper divisors (2040255620800).

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

1620104116520 is a wasteful number, since it uses less digits than its factorization.

1620104116520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168060845 (or 168060841 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 29.

Adding to 1620104116520 its reverse (256114010261), we get a palindrome (1876218126781).

The spelling of 1620104116520 in words is "one trillion, six hundred twenty billion, one hundred four million, one hundred sixteen thousand, five hundred twenty".