667520434416623 has 4 divisors (see below), whose sum is σ = 668431103495688. Its totient is φ = 666609765337560.

The previous prime is 667520434416581. The next prime is 667520434416631. The reversal of 667520434416623 is 326614434025766.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 667520434416623 - 2⁶ = 667520434416559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667520434410623) 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, 455334538433 + ... + 455334539898.

It is an arithmetic number, because the mean of its divisors is an integer number (167107775873922).

Almost surely, 2^{667520434416623} is an apocalyptic number.

667520434416623 is a deficient number, since it is larger than the sum of its proper divisors (910669079065).

667520434416623 is an equidigital number, since it uses as much as digits as its factorization.

667520434416623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 910669079064.

The product of its (nonzero) digits is 104509440, while the sum is 59.

The spelling of 667520434416623 in words is "six hundred sixty-seven trillion, five hundred twenty billion, four hundred thirty-four million, four hundred sixteen thousand, six hundred twenty-three".