668098481 has 4 divisors (see below), whose sum is σ = 669764964. Its totient is φ = 666432000.

The previous prime is 668098471. The next prime is 668098507. The reversal of 668098481 is 184890866.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 384512881 + 283585600 = 19609^2 + 16840^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-668098481 is a prime.

It is a super-2 number, since 2×668098481² = 892711160629014722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (668098451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 832640 + ... + 833441.

It is an arithmetic number, because the mean of its divisors is an integer number (167441241).

Almost surely, 2^668098481 is an apocalyptic number.

It is an amenable number.

668098481 is a deficient number, since it is larger than the sum of its proper divisors (1666483).

668098481 is a wasteful number, since it uses less digits than its factorization.

668098481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1666482.

The product of its (nonzero) digits is 663552, while the sum is 50.

The square root of 668098481 is about 25847.6010685711. The cubic root of 668098481 is about 874.2054200550.

The spelling of 668098481 in words is "six hundred sixty-eight million, ninety-eight thousand, four hundred eighty-one".