16635969380 has 24 divisors (see below), whose sum is σ = 34941223800. Its totient is φ = 6653304320.

The previous prime is 16635969377. The next prime is 16635969401. The reversal of 16635969380 is 8396953661.

It can be written as a sum of positive squares in 4 ways, for example, as 11658384676 + 4977584704 = 107974^2 + 70552^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64490 + ... + 193470.

It is an arithmetic number, because the mean of its divisors is an integer number (1455884325).

Almost surely, 2^16635969380 is an apocalyptic number.

16635969380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a pronic number, being equal to 128980×128981.

It is an amenable number.

16635969380 is an abundant number, since it is smaller than the sum of its proper divisors (18305254420).

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

16635969380 is a wasteful number, since it uses less digits than its factorization.

16635969380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135439 (or 135437 counting only the distinct ones).

The product of its (nonzero) digits is 6298560, while the sum is 56.

The spelling of 16635969380 in words is "sixteen billion, six hundred thirty-five million, nine hundred sixty-nine thousand, three hundred eighty".