616421161800 has 288 divisors, whose sum is σ = 2204848464000. Its totient is φ = 159935834880.

The previous prime is 616421161789. The next prime is 616421161847. The reversal of 616421161800 is 8161124616.

616421161800 is a `hidden beast` number, since 6 + 1 + 642 + 1 + 1 + 6 + 1 + 8 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1626801 + ... + 1969599.

Almost surely, 2^616421161800 is an apocalyptic number.

616421161800 is a gapful number since it is divisible by the number (60) 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 616421161800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1102424232000).

616421161800 is an abundant number, since it is smaller than the sum of its proper divisors (1588427302200).

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

616421161800 is a wasteful number, since it uses less digits than its factorization.

616421161800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342867 (or 342846 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The spelling of 616421161800 in words is "six hundred sixteen billion, four hundred twenty-one million, one hundred sixty-one thousand, eight hundred".