16661671539 has 32 divisors (see below), whose sum is σ = 24122400000. Its totient is φ = 10193745024.

The previous prime is 16661671531. The next prime is 16661671541. The reversal of 16661671539 is 93517616661.

It is not a de Polignac number, because 16661671539 - 2³ = 16661671531 is a prime.

It is a super-2 number, since 2×16661671539² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16661671491 and 16661671500.

It is not an unprimeable number, because it can be changed into a prime (16661671531) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 465712 + ... + 500210.

It is an arithmetic number, because the mean of its divisors is an integer number (753825000).

Almost surely, 2^16661671539 is an apocalyptic number.

16661671539 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

16661671539 is a deficient number, since it is larger than the sum of its proper divisors (7460728461).

16661671539 is a wasteful number, since it uses less digits than its factorization.

16661671539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34787.

The product of its digits is 1224720, while the sum is 51.

The spelling of 16661671539 in words is "sixteen billion, six hundred sixty-one million, six hundred seventy-one thousand, five hundred thirty-nine".