268742557477 has 4 divisors (see below), whose sum is σ = 268886195136. Its totient is φ = 268598919820.

The previous prime is 268742557439. The next prime is 268742557493. The reversal of 268742557477 is 774755247862.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 268742557477 - 2¹¹ = 268742555429 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 (268742557417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71816023 + ... + 71819764.

It is an arithmetic number, because the mean of its divisors is an integer number (67221548784).

Almost surely, 2^268742557477 is an apocalyptic number.

It is an amenable number.

268742557477 is a deficient number, since it is larger than the sum of its proper divisors (143637659).

268742557477 is a wasteful number, since it uses less digits than its factorization.

268742557477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143637658.

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

The spelling of 268742557477 in words is "two hundred sixty-eight billion, seven hundred forty-two million, five hundred fifty-seven thousand, four hundred seventy-seven".