513257661706 has 8 divisors (see below), whose sum is σ = 769891674564. Its totient is φ = 256627103520.

The previous prime is 513257661629. The next prime is 513257661779. The reversal of 513257661706 is 607166752315.

It can be written as a sum of positive squares in 2 ways, for example, as 358447677025 + 154809984681 = 598705^2 + 393459^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 513257661706.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 453235 + ... + 1109926.

Almost surely, 2^513257661706 is an apocalyptic number.

513257661706 is a deficient number, since it is larger than the sum of its proper divisors (256634012858).

513257661706 is a wasteful number, since it uses less digits than its factorization.

513257661706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1727336.

The product of its (nonzero) digits is 1587600, while the sum is 49.

The spelling of 513257661706 in words is "five hundred thirteen billion, two hundred fifty-seven million, six hundred sixty-one thousand, seven hundred six".