669215619136 has 63 divisors (see below), whose sum is σ = 1336351606311. Its totient is φ = 332510313984.

The previous prime is 669215619133. The next prime is 669215619139. The reversal of 669215619136 is 631916512966.

The square root of 669215619136 is 818056.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (669215619133) and next prime (669215619139).

It can be written as a sum of positive squares in 4 ways, for example, as 340822440000 + 328393179136 = 583800^2 + 573056^2 .

It is a Duffinian number.

Its product of digits (3149280) is a multiple of the sum of its prime factors (1296).

It is not an unprimeable number, because it can be changed into a prime (669215619131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1917523090 + ... + 1917523438.

Almost surely, 2^669215619136 is an apocalyptic number.

669215619136 is the 818056-th square number.

It is an amenable number.

669215619136 is a deficient number, since it is larger than the sum of its proper divisors (667135987175).

669215619136 is an frugal number, since it uses more digits than its factorization.

669215619136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1296 (or 644 counting only the distinct ones).

The product of its digits is 3149280, while the sum is 55.

The spelling of 669215619136 in words is "six hundred sixty-nine billion, two hundred fifteen million, six hundred nineteen thousand, one hundred thirty-six".