669764221543 has 16 divisors (see below), whose sum is σ = 675991536640. Its totient is φ = 663558630336.

The previous prime is 669764221531. The next prime is 669764221639. The reversal of 669764221543 is 345122467966.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-669764221543 is a prime.

It is a super-2 number, since 2×669764221543² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669764251543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 234427771 + ... + 234430627.

It is an arithmetic number, because the mean of its divisors is an integer number (42249471040).

Almost surely, 2^669764221543 is an apocalyptic number.

669764221543 is a deficient number, since it is larger than the sum of its proper divisors (6227315097).

669764221543 is a wasteful number, since it uses less digits than its factorization.

669764221543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5926.

The product of its digits is 13063680, while the sum is 55.

The spelling of 669764221543 in words is "six hundred sixty-nine billion, seven hundred sixty-four million, two hundred twenty-one thousand, five hundred forty-three".