501663623 has 4 divisors (see below), whose sum is σ = 501889920. Its totient is φ = 501437328.

The previous prime is 501663611. The next prime is 501663647. The reversal of 501663623 is 326366105.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 501663623 - 2⁸ = 501663367 is a prime.

It is a super-2 number, since 2×501663623² = 503332781282972258, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 501663623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (501663653) 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, 109790 + ... + 114267.

It is an arithmetic number, because the mean of its divisors is an integer number (125472480).

Almost surely, 2^501663623 is an apocalyptic number.

501663623 is a deficient number, since it is larger than the sum of its proper divisors (226297).

501663623 is a wasteful number, since it uses less digits than its factorization.

501663623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226296.

The product of its (nonzero) digits is 19440, while the sum is 32.

The square root of 501663623 is about 22397.8486243657. The cubic root of 501663623 is about 794.5798304500.

The spelling of 501663623 in words is "five hundred one million, six hundred sixty-three thousand, six hundred twenty-three".