16145556644 has 36 divisors (see below), whose sum is σ = 33118691760. Its totient is φ = 6866692560.

The previous prime is 16145556569. The next prime is 16145556649. The reversal of 16145556644 is 44665554161.

It is a super-2 number, since 2×16145556644² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16145556649) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 288734 + ... + 340085.

It is an arithmetic number, because the mean of its divisors is an integer number (919963660).

Almost surely, 2^16145556644 is an apocalyptic number.

16145556644 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

16145556644 is an abundant number, since it is smaller than the sum of its proper divisors (16973135116).

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

16145556644 is a wasteful number, since it uses less digits than its factorization.

16145556644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628968 (or 628959 counting only the distinct ones).

The product of its digits is 1728000, while the sum is 47.

The spelling of 16145556644 in words is "sixteen billion, one hundred forty-five million, five hundred fifty-six thousand, six hundred forty-four".