669975778378 has 8 divisors (see below), whose sum is σ = 1004992891200. Its totient is φ = 334978147980.

The previous prime is 669975778337. The next prime is 669975778391. The reversal of 669975778378 is 873877579966.

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

It is a super-2 number, since 2×669975778378² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4784328 + ... + 4922371.

It is an arithmetic number, because the mean of its divisors is an integer number (125624111400).

Almost surely, 2^669975778378 is an apocalyptic number.

669975778378 is a deficient number, since it is larger than the sum of its proper divisors (335017112822).

669975778378 is a wasteful number, since it uses less digits than its factorization.

669975778378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9741212.

The product of its digits is 6721263360, while the sum is 82.

The spelling of 669975778378 in words is "six hundred sixty-nine billion, nine hundred seventy-five million, seven hundred seventy-eight thousand, three hundred seventy-eight".