665421421034 has 8 divisors (see below), whose sum is σ = 1001280814308. Its totient is φ = 331661149600.

The previous prime is 665421421033. The next prime is 665421421039. The reversal of 665421421034 is 430124124566.

It can be written as a sum of positive squares in 2 ways, for example, as 664546148809 + 875272225 = 815197^2 + 29585^2 .

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

It is not an unprimeable number, because it can be changed into a prime (665421421031) 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, 524779667 + ... + 524780934.

Almost surely, 2^665421421034 is an apocalyptic number.

665421421034 is a deficient number, since it is larger than the sum of its proper divisors (335859393274).

665421421034 is a wasteful number, since it uses less digits than its factorization.

665421421034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1049560920.

The product of its (nonzero) digits is 138240, while the sum is 38.

The spelling of 665421421034 in words is "six hundred sixty-five billion, four hundred twenty-one million, four hundred twenty-one thousand, thirty-four".