669698520 has 64 divisors (see below), whose sum is σ = 2063409120. Its totient is φ = 173758464.

The previous prime is 669698473. The next prime is 669698581. The reversal of 669698520 is 25896966.

It is a super-2 number, since 2×669698520² = 896992215380380800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70977 + ... + 79856.

Almost surely, 2^669698520 is an apocalyptic number.

669698520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

669698520 is an abundant number, since it is smaller than the sum of its proper divisors (1393710600).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

669698520 is a wasteful number, since it uses less digits than its factorization.

669698520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150884 (or 150880 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 51.

The square root of 669698520 is about 25878.5339615675. The cubic root of 669698520 is about 874.9027461977.

The spelling of 669698520 in words is "six hundred sixty-nine million, six hundred ninety-eight thousand, five hundred twenty".