16120621520 has 20 divisors (see below), whose sum is σ = 37480445220. Its totient is φ = 6448248576.

The previous prime is 16120621513. The next prime is 16120621523. The reversal of 16120621520 is 2512602161.

It can be written as a sum of positive squares in 2 ways, for example, as 5600426896 + 10520194624 = 74836^2 + 102568^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×16120621520² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16120621520.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16120621523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100753805 + ... + 100753964.

It is an arithmetic number, because the mean of its divisors is an integer number (1874022261).

Almost surely, 2^16120621520 is an apocalyptic number.

16120621520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16120621520 is an abundant number, since it is smaller than the sum of its proper divisors (21359823700).

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

16120621520 is a wasteful number, since it uses less digits than its factorization.

16120621520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201507782 (or 201507776 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The spelling of 16120621520 in words is "sixteen billion, one hundred twenty million, six hundred twenty-one thousand, five hundred twenty".