16780452165 has 48 divisors (see below), whose sum is σ = 29668839408. Its totient is φ = 8770664448.

The previous prime is 16780452127. The next prime is 16780452181. The reversal of 16780452165 is 56125408761.

16780452165 is a `hidden beast` number, since 1 + 67 + 8 + 0 + 4 + 521 + 65 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 5756712129 + 11023740036 = 75873^2 + 104994^2 .

It is not a de Polignac number, because 16780452165 - 2¹³ = 16780443973 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 16780452165.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2374317 + ... + 2381373.

It is an arithmetic number, because the mean of its divisors is an integer number (618100821).

Almost surely, 2^16780452165 is an apocalyptic number.

16780452165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16780452165 is a deficient number, since it is larger than the sum of its proper divisors (12888387243).

16780452165 is a wasteful number, since it uses less digits than its factorization.

16780452165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8118 (or 8115 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 45.

The spelling of 16780452165 in words is "sixteen billion, seven hundred eighty million, four hundred fifty-two thousand, one hundred sixty-five".