670221355523 has 4 divisors (see below), whose sum is σ = 709646141160. Its totient is φ = 630796569888.

The previous prime is 670221355519. The next prime is 670221355541. The reversal of 670221355523 is 325553122076.

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 670221355523 - 2² = 670221355519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (670221355543) 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, 19712392793 + ... + 19712392826.

It is an arithmetic number, because the mean of its divisors is an integer number (177411535290).

Almost surely, 2^670221355523 is an apocalyptic number.

670221355523 is a deficient number, since it is larger than the sum of its proper divisors (39424785637).

670221355523 is a wasteful number, since it uses less digits than its factorization.

670221355523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39424785636.

The product of its (nonzero) digits is 378000, while the sum is 41.

Adding to 670221355523 its reverse (325553122076), we get a palindrome (995774477599).

The spelling of 670221355523 in words is "six hundred seventy billion, two hundred twenty-one million, three hundred fifty-five thousand, five hundred twenty-three".