16538439951 has 40 divisors (see below), whose sum is σ = 26972352000. Its totient is φ = 10015554960.

The previous prime is 16538439943. The next prime is 16538439977. The reversal of 16538439951 is 15993483561.

16538439951 is a `hidden beast` number, since 16 + 538 + 4 + 3 + 9 + 95 + 1 = 666.

16538439951 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 16538439951 - 2³ = 16538439943 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16538449951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1275700 + ... + 1288598.

It is an arithmetic number, because the mean of its divisors is an integer number (674308800).

Almost surely, 2^16538439951 is an apocalyptic number.

16538439951 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16538439951 is a deficient number, since it is larger than the sum of its proper divisors (10433912049).

16538439951 is a wasteful number, since it uses less digits than its factorization.

16538439951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14361 (or 14352 counting only the distinct ones).

The product of its digits is 3499200, while the sum is 54.

The spelling of 16538439951 in words is "sixteen billion, five hundred thirty-eight million, four hundred thirty-nine thousand, nine hundred fifty-one".