16491132738 has 32 divisors (see below), whose sum is σ = 36719020800. Its totient is φ = 5486235408.

The previous prime is 16491132737. The next prime is 16491132739. The reversal of 16491132738 is 83723119461.

It is an interprime number because it is at equal distance from previous prime (16491132737) and next prime (16491132739).

It is a junction number, because it is equal to n+sod(n) for n = 16491132693 and 16491132702.

It is not an unprimeable number, because it can be changed into a prime (16491132731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 272506 + ... + 327477.

It is an arithmetic number, because the mean of its divisors is an integer number (1147469400).

Almost surely, 2^16491132738 is an apocalyptic number.

16491132738 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

16491132738 is an abundant number, since it is smaller than the sum of its proper divisors (20227888062).

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

16491132738 is a wasteful number, since it uses less digits than its factorization.

16491132738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600503 (or 600497 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The spelling of 16491132738 in words is "sixteen billion, four hundred ninety-one million, one hundred thirty-two thousand, seven hundred thirty-eight".