361865556 has 120 divisors (see below), whose sum is σ = 1038618504. Its totient is φ = 109175040.

The previous prime is 361865533. The next prime is 361865617. The reversal of 361865556 is 655568163.

361865556 is a `hidden beast` number, since 36 + 1 + 8 + 65 + 556 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 69455556 + 292410000 = 8334^2 + 17100^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 222426 + ... + 224046.

Almost surely, 2^361865556 is an apocalyptic number.

361865556 is a gapful number since it is divisible by the number (36) 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 361865556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (519309252).

361865556 is an abundant number, since it is smaller than the sum of its proper divisors (676752948).

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

361865556 is a wasteful number, since it uses less digits than its factorization.

361865556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1703 (or 1692 counting only the distinct ones).

The product of its digits is 648000, while the sum is 45.

The square root of 361865556 is about 19022.7641524569. The cubic root of 361865556 is about 712.6053561655.

The spelling of 361865556 in words is "three hundred sixty-one million, eight hundred sixty-five thousand, five hundred fifty-six".