16138003720 has 32 divisors (see below), whose sum is σ = 36643642200. Its totient is φ = 6395977728.

The previous prime is 16138003699. The next prime is 16138003757. The reversal of 16138003720 is 2730083161.

It can be written as a sum of positive squares in 4 ways, for example, as 15613502116 + 524501604 = 124954^2 + 22902^2 .

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, 1846329 + ... + 1855048.

Almost surely, 2^16138003720 is an apocalyptic number.

16138003720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16138003720 is an abundant number, since it is smaller than the sum of its proper divisors (20505638480).

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

16138003720 is a wasteful number, since it uses less digits than its factorization.

16138003720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3701497 (or 3701493 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 31.

Adding to 16138003720 its reverse (2730083161), we get a palindrome (18868086881).

The spelling of 16138003720 in words is "sixteen billion, one hundred thirty-eight million, three thousand, seven hundred twenty".