257122620147 has 4 divisors (see below), whose sum is σ = 342830160200. Its totient is φ = 171415080096.

The previous prime is 257122620137. The next prime is 257122620317. The reversal of 257122620147 is 741026221752.

It is a happy number.

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

It is not a de Polignac number, because 257122620147 - 2⁷ = 257122620019 is a prime.

It is a super-2 number, since 2×257122620147² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257122620127) 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, 42853770022 + ... + 42853770027.

It is an arithmetic number, because the mean of its divisors is an integer number (85707540050).

Almost surely, 2^257122620147 is an apocalyptic number.

257122620147 is a deficient number, since it is larger than the sum of its proper divisors (85707540053).

257122620147 is an equidigital number, since it uses as much as digits as its factorization.

257122620147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85707540052.

The product of its (nonzero) digits is 94080, while the sum is 39.

Adding to 257122620147 its reverse (741026221752), we get a palindrome (998148841899).

The spelling of 257122620147 in words is "two hundred fifty-seven billion, one hundred twenty-two million, six hundred twenty thousand, one hundred forty-seven".