690173663 has 4 divisors (see below), whose sum is σ = 691241040. Its totient is φ = 689106288.

The previous prime is 690173657. The next prime is 690173683. The reversal of 690173663 is 366371096.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-690173663 is a prime.

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 690173663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690173683) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 532718 + ... + 534011.

It is an arithmetic number, because the mean of its divisors is an integer number (172810260).

Almost surely, 2^690173663 is an apocalyptic number.

690173663 is a deficient number, since it is larger than the sum of its proper divisors (1067377).

690173663 is a wasteful number, since it uses less digits than its factorization.

690173663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1067376.

The product of its (nonzero) digits is 122472, while the sum is 41.

The square root of 690173663 is about 26271.1564838703. The cubic root of 690173663 is about 883.7297204570.

The spelling of 690173663 in words is "six hundred ninety million, one hundred seventy-three thousand, six hundred sixty-three".