257621542747147 has 4 divisors (see below), whose sum is σ = 272775751144056. Its totient is φ = 242467334350240.

The previous prime is 257621542747139. The next prime is 257621542747169. The reversal of 257621542747147 is 741747245126752.

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

It is a cyclic number.

It is not a de Polignac number, because 257621542747147 - 2³ = 257621542747139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257621542777147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7577104198429 + ... + 7577104198462.

It is an arithmetic number, because the mean of its divisors is an integer number (68193937786014).

Almost surely, 2^{257621542747147} is an apocalyptic number.

257621542747147 is a deficient number, since it is larger than the sum of its proper divisors (15154208396909).

257621542747147 is a wasteful number, since it uses less digits than its factorization.

257621542747147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15154208396908.

The product of its digits is 184396800, while the sum is 64.

The spelling of 257621542747147 in words is "two hundred fifty-seven trillion, six hundred twenty-one billion, five hundred forty-two million, seven hundred forty-seven thousand, one hundred forty-seven".