18206531616 has 384 divisors, whose sum is σ = 63751919616. Its totient is φ = 4412620800.

The previous prime is 18206531587. The next prime is 18206531617. The reversal of 18206531616 is 61613560281.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (18206531617) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6384591 + ... + 6387441.

It is an arithmetic number, because the mean of its divisors is an integer number (166020624).

Almost surely, 2^18206531616 is an apocalyptic number.

18206531616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18206531616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31875959808).

18206531616 is an abundant number, since it is smaller than the sum of its proper divisors (45545388000).

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

18206531616 is a wasteful number, since it uses less digits than its factorization.

18206531616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2944 (or 2936 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 39.

The spelling of 18206531616 in words is "eighteen billion, two hundred six million, five hundred thirty-one thousand, six hundred sixteen".