257531803061 has 8 divisors (see below), whose sum is σ = 277352408760. Its totient is φ = 237712692672.

The previous prime is 257531803051. The next prime is 257531803073. The reversal of 257531803061 is 160308135752.

It can be written as a sum of positive squares in 4 ways, for example, as 3732476836 + 253799326225 = 61094^2 + 503785^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-257531803061 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 (257531803051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2450 + ... + 717683.

It is an arithmetic number, because the mean of its divisors is an integer number (34669051095).

Almost surely, 2^257531803061 is an apocalyptic number.

It is an amenable number.

257531803061 is a deficient number, since it is larger than the sum of its proper divisors (19820605699).

257531803061 is a wasteful number, since it uses less digits than its factorization.

257531803061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 747655.

The product of its (nonzero) digits is 151200, while the sum is 41.

The spelling of 257531803061 in words is "two hundred fifty-seven billion, five hundred thirty-one million, eight hundred three thousand, sixty-one".