361819839621816 has 128 divisors (see below), whose sum is σ = 1037495415398400. Its totient is φ = 116713920366720.

The previous prime is 361819839621811. The next prime is 361819839621817. The reversal of 361819839621816 is 618126938918163.

361819839621816 is a `hidden beast` number, since 3 + 6 + 1 + 8 + 1 + 9 + 8 + 396 + 218 + 16 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (361819839621811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 383966865 + ... + 384908031.

It is an arithmetic number, because the mean of its divisors is an integer number (8105432932800).

Almost surely, 2^{361819839621816} is an apocalyptic number.

361819839621816 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

361819839621816 is an abundant number, since it is smaller than the sum of its proper divisors (675675575776584).

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

361819839621816 is a wasteful number, since it uses less digits than its factorization.

361819839621816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 998626 (or 998616 counting only the distinct ones).

The product of its digits is 161243136, while the sum is 72.

The spelling of 361819839621816 in words is "three hundred sixty-one trillion, eight hundred nineteen billion, eight hundred thirty-nine million, six hundred twenty-one thousand, eight hundred sixteen".