668737291475 has 36 divisors (see below), whose sum is σ = 912298865832. Its totient is φ = 486245905200.

The previous prime is 668737291471. The next prime is 668737291531. The reversal of 668737291475 is 574192737866.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is not a de Polignac number, because 668737291475 - 2² = 668737291471 is a prime.

It is a super-3 number, since 3×668737291475³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668737291471) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 149169584 + ... + 149174066.

It is an arithmetic number, because the mean of its divisors is an integer number (25341635162).

Almost surely, 2^668737291475 is an apocalyptic number.

668737291475 is a deficient number, since it is larger than the sum of its proper divisors (243561574357).

668737291475 is an frugal number, since it uses more digits than its factorization.

668737291475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9009 (or 4499 counting only the distinct ones).

The product of its digits is 106686720, while the sum is 65.

The spelling of 668737291475 in words is "six hundred sixty-eight billion, seven hundred thirty-seven million, two hundred ninety-one thousand, four hundred seventy-five".