690626282909 has 4 divisors (see below), whose sum is σ = 691116437820. Its totient is φ = 690136128000.

The previous prime is 690626282897. The next prime is 690626282917. The reversal of 690626282909 is 909282626096.

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

It can be written as a sum of positive squares in 2 ways, for example, as 195850502500 + 494775780409 = 442550^2 + 703403^2 .

It is a cyclic number.

It is not a de Polignac number, because 690626282909 - 2²⁸ = 690357847453 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 (690626282209) 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, 245075342 + ... + 245078159.

It is an arithmetic number, because the mean of its divisors is an integer number (172779109455).

Almost surely, 2^690626282909 is an apocalyptic number.

It is an amenable number.

690626282909 is a deficient number, since it is larger than the sum of its proper divisors (490154911).

690626282909 is a wasteful number, since it uses less digits than its factorization.

690626282909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490154910.

The product of its (nonzero) digits is 10077696, while the sum is 59.

The spelling of 690626282909 in words is "six hundred ninety billion, six hundred twenty-six million, two hundred eighty-two thousand, nine hundred nine".