258799666 has 4 divisors (see below), whose sum is σ = 388199502. Its totient is φ = 129399832.

The previous prime is 258799663. The next prime is 258799669. The reversal of 258799666 is 666997852.

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

It is an interprime number because it is at equal distance from previous prime (258799663) and next prime (258799669).

It can be written as a sum of positive squares in only one way, i.e., 244015641 + 14784025 = 15621^2 + 3845^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 258799666.

It is not an unprimeable number, because it can be changed into a prime (258799661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64699915 + ... + 64699918.

Almost surely, 2^258799666 is an apocalyptic number.

258799666 is a deficient number, since it is larger than the sum of its proper divisors (129399836).

258799666 is a wasteful number, since it uses less digits than its factorization.

258799666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129399835.

The product of its digits is 9797760, while the sum is 58.

The square root of 258799666 is about 16087.2516608649. The cubic root of 258799666 is about 637.2667174640.

The spelling of 258799666 in words is "two hundred fifty-eight million, seven hundred ninety-nine thousand, six hundred sixty-six".