245591557281 has 128 divisors (see below), whose sum is σ = 456891494400. Its totient is φ = 127127024640.

The previous prime is 245591557273. The next prime is 245591557319. The reversal of 245591557281 is 182755195542.

It is a happy number.

245591557281 is a `hidden beast` number, since 2 + 4 + 5 + 5 + 9 + 1 + 557 + 2 + 81 = 666.

It is not a de Polignac number, because 245591557281 - 2³ = 245591557273 is a prime.

It is a super-2 number, since 2×245591557281² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (245591557201) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 30837606 + ... + 30845568.

It is an arithmetic number, because the mean of its divisors is an integer number (3569464800).

Almost surely, 2^245591557281 is an apocalyptic number.

245591557281 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

245591557281 is a deficient number, since it is larger than the sum of its proper divisors (211299937119).

245591557281 is a wasteful number, since it uses less digits than its factorization.

245591557281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8356 (or 8350 counting only the distinct ones).

The product of its digits is 5040000, while the sum is 54.

The spelling of 245591557281 in words is "two hundred forty-five billion, five hundred ninety-one million, five hundred fifty-seven thousand, two hundred eighty-one".