16510965025 has 27 divisors (see below), whose sum is σ = 21180889593. Its totient is φ = 12767263200.

The previous prime is 16510965017. The next prime is 16510965049. The reversal of 16510965025 is 52056901561.

The square root of 16510965025 is 128495.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 71622369 + 16439342656 = 8463^2 + 128216^2 .

It is not a de Polignac number, because 16510965025 - 2³ = 16510965017 is a prime.

It is a super-2 number, since 2×16510965025² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 19916311 + ... + 19917139.

Almost surely, 2^16510965025 is an apocalyptic number.

16510965025 is the 128495-th square number.

16510965025 is the 64248-th centered octagonal number.

It is an amenable number.

16510965025 is a deficient number, since it is larger than the sum of its proper divisors (4669924568).

16510965025 is an frugal number, since it uses more digits than its factorization.

16510965025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1730 (or 865 counting only the distinct ones).

The product of its (nonzero) digits is 81000, while the sum is 40.

The spelling of 16510965025 in words is "sixteen billion, five hundred ten million, nine hundred sixty-five thousand, twenty-five".