661246364 has 6 divisors (see below), whose sum is σ = 1157181144. Its totient is φ = 330623180.

The previous prime is 661246363. The next prime is 661246387. The reversal of 661246364 is 463642166.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661246361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82655792 + ... + 82655799.

It is an arithmetic number, because the mean of its divisors is an integer number (192863524).

Almost surely, 2^661246364 is an apocalyptic number.

It is an amenable number.

661246364 is a deficient number, since it is larger than the sum of its proper divisors (495934780).

661246364 is a wasteful number, since it uses less digits than its factorization.

661246364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165311595 (or 165311593 counting only the distinct ones).

The product of its digits is 124416, while the sum is 38.

The square root of 661246364 is about 25714.7110425142. The cubic root of 661246364 is about 871.2064839559.

The spelling of 661246364 in words is "six hundred sixty-one million, two hundred forty-six thousand, three hundred sixty-four".