690330661 has 4 divisors (see below), whose sum is σ = 712599424. Its totient is φ = 668061900.

The previous prime is 690330659. The next prime is 690330787. The reversal of 690330661 is 166033096.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 690330661 - 2¹ = 690330659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690330631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11134335 + ... + 11134396.

It is an arithmetic number, because the mean of its divisors is an integer number (178149856).

Almost surely, 2^690330661 is an apocalyptic number.

It is an amenable number.

690330661 is a deficient number, since it is larger than the sum of its proper divisors (22268763).

690330661 is a wasteful number, since it uses less digits than its factorization.

690330661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22268762.

The product of its (nonzero) digits is 17496, while the sum is 34.

The square root of 690330661 is about 26274.1443438221. The cubic root of 690330661 is about 883.7967245011.

The spelling of 690330661 in words is "six hundred ninety million, three hundred thirty thousand, six hundred sixty-one".