669679081 has 8 divisors (see below), whose sum is σ = 697745664. Its totient is φ = 642016560.

The previous prime is 669679069. The next prime is 669679091. The reversal of 669679081 is 180976966.

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

It is a cyclic number.

It is not a de Polignac number, because 669679081 - 2¹¹ = 669677033 is a prime.

It is a super-2 number, since 2×669679081² = 896940143058009122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (669679061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97630 + ... + 104263.

It is an arithmetic number, because the mean of its divisors is an integer number (87218208).

Almost surely, 2^669679081 is an apocalyptic number.

It is an amenable number.

669679081 is a deficient number, since it is larger than the sum of its proper divisors (28066583).

669679081 is a wasteful number, since it uses less digits than its factorization.

669679081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202031.

The product of its (nonzero) digits is 979776, while the sum is 52.

The square root of 669679081 is about 25878.1583772880. The cubic root of 669679081 is about 874.8942809961.

The spelling of 669679081 in words is "six hundred sixty-nine million, six hundred seventy-nine thousand, eighty-one".