667258724642 has 8 divisors (see below), whose sum is σ = 1001367216300. Its totient is φ = 333469652544.

The previous prime is 667258724611. The next prime is 667258724653. The reversal of 667258724642 is 246427852766.

It can be written as a sum of positive squares in 2 ways, for example, as 659261178601 + 7997546041 = 811949^2 + 89429^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×667258724642² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79849667 + ... + 79858022.

Almost surely, 2^667258724642 is an apocalyptic number.

667258724642 is a deficient number, since it is larger than the sum of its proper divisors (334108491658).

667258724642 is a wasteful number, since it uses less digits than its factorization.

667258724642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159709780.

The product of its digits is 54190080, while the sum is 59.

The spelling of 667258724642 in words is "six hundred sixty-seven billion, two hundred fifty-eight million, seven hundred twenty-four thousand, six hundred forty-two".