665121467 has 8 divisors (see below), whose sum is σ = 724270800. Its totient is φ = 608386464.

The previous prime is 665121449. The next prime is 665121473. The reversal of 665121467 is 764121566.

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

It is a cyclic number.

It is not a de Polignac number, because 665121467 - 2¹² = 665117371 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 665121467.

It is not an unprimeable number, because it can be changed into a prime (665121407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 603008 + ... + 604109.

It is an arithmetic number, because the mean of its divisors is an integer number (90533850).

Almost surely, 2^665121467 is an apocalyptic number.

665121467 is a deficient number, since it is larger than the sum of its proper divisors (59149333).

665121467 is a wasteful number, since it uses less digits than its factorization.

665121467 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1207165.

The product of its digits is 60480, while the sum is 38.

The square root of 665121467 is about 25789.9489530321. The cubic root of 665121467 is about 872.9050144930.

Subtracting 665121467 from its reverse (764121566), we obtain a palindrome (99000099).

The spelling of 665121467 in words is "six hundred sixty-five million, one hundred twenty-one thousand, four hundred sixty-seven".