16635161540 has 24 divisors (see below), whose sum is σ = 36138455640. Its totient is φ = 6424613888.

The previous prime is 16635161537. The next prime is 16635161573. The reversal of 16635161540 is 4516153661.

It can be written as a sum of positive squares in 4 ways, for example, as 5095675456 + 11539486084 = 71384^2 + 107422^2 .

It is a junction number, because it is equal to n+sod(n) for n = 16635161494 and 16635161503.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14340077 + ... + 14341236.

It is an arithmetic number, because the mean of its divisors is an integer number (1505768985).

Almost surely, 2^16635161540 is an apocalyptic number.

16635161540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16635161540 is an abundant number, since it is smaller than the sum of its proper divisors (19503294100).

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

16635161540 is a wasteful number, since it uses less digits than its factorization.

16635161540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28681351 (or 28681349 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 38.

The spelling of 16635161540 in words is "sixteen billion, six hundred thirty-five million, one hundred sixty-one thousand, five hundred forty".