662261618 has 18 divisors (see below), whose sum is σ = 1028222703. Its totient is φ = 319903260.

The previous prime is 662261617. The next prime is 662261623. The reversal of 662261618 is 816162266.

It can be written as a sum of positive squares in only one way, i.e., 331130809 + 331130809 = 18197^2 + 18197^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=18197.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (662261617) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1127921 + ... + 1128507.

Almost surely, 2^662261618 is an apocalyptic number.

662261618 is a deficient number, since it is larger than the sum of its proper divisors (365961085).

662261618 is an frugal number, since it uses more digits than its factorization.

662261618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1238 (or 620 counting only the distinct ones).

The product of its digits is 41472, while the sum is 38.

The square root of 662261618 is about 25734.4441945032. Note that the first 3 decimals coincide. The cubic root of 662261618 is about 871.6521290422.

Multiplying 662261618 by its product of digits (41472), we get a square (27465313821696 = 5240736²).

The spelling of 662261618 in words is "six hundred sixty-two million, two hundred sixty-one thousand, six hundred eighteen".