665620534 has 8 divisors (see below), whose sum is σ = 1017269280. Its totient is φ = 326530776.

The previous prime is 665620517. The next prime is 665620537. The reversal of 665620534 is 435026566.

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

It is a junction number, because it is equal to n+sod(n) for n = 665620493 and 665620502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665620537) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3139614 + ... + 3139825.

It is an arithmetic number, because the mean of its divisors is an integer number (127158660).

Almost surely, 2^665620534 is an apocalyptic number.

665620534 is a deficient number, since it is larger than the sum of its proper divisors (351648746).

665620534 is a wasteful number, since it uses less digits than its factorization.

665620534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6279494.

The product of its (nonzero) digits is 129600, while the sum is 37.

The square root of 665620534 is about 25799.6227491799. The cubic root of 665620534 is about 873.1232849869.

The spelling of 665620534 in words is "six hundred sixty-five million, six hundred twenty thousand, five hundred thirty-four".