215145446644 has 6 divisors (see below), whose sum is σ = 376504531634. Its totient is φ = 107572723320.

The previous prime is 215145446629. The next prime is 215145446647. The reversal of 215145446644 is 446644541512.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 213721290000 + 1424156644 = 462300^2 + 37738^2 .

It is a junction number, because it is equal to n+sod(n) for n = 215145446594 and 215145446603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215145446647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26893180827 + ... + 26893180834.

Almost surely, 2^215145446644 is an apocalyptic number.

It is an amenable number.

215145446644 is a deficient number, since it is larger than the sum of its proper divisors (161359084990).

215145446644 is a wasteful number, since it uses less digits than its factorization.

215145446644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53786361665 (or 53786361663 counting only the distinct ones).

The product of its digits is 1843200, while the sum is 46.

The spelling of 215145446644 in words is "two hundred fifteen billion, one hundred forty-five million, four hundred forty-six thousand, six hundred forty-four".