659674981 has 16 divisors (see below), whose sum is σ = 764600704. Its totient is φ = 557466624.

The previous prime is 659674963. The next prime is 659674991. The reversal of 659674981 is 189476956.

It is a cyclic number.

It is not a de Polignac number, because 659674981 - 2¹⁹ = 659150693 is a prime.

It is a super-2 number, since 2×659674981² = 870342161114700722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (659674901) 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 15 ways as a sum of consecutive naturals, for example, 190441 + ... + 193873.

It is an arithmetic number, because the mean of its divisors is an integer number (47787544).

Almost surely, 2^659674981 is an apocalyptic number.

It is an amenable number.

659674981 is a deficient number, since it is larger than the sum of its proper divisors (104925723).

659674981 is a wasteful number, since it uses less digits than its factorization.

659674981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3820.

The product of its digits is 3265920, while the sum is 55.

The square root of 659674981 is about 25684.1387046558. The cubic root of 659674981 is about 870.5158261342.

The spelling of 659674981 in words is "six hundred fifty-nine million, six hundred seventy-four thousand, nine hundred eighty-one".