268997057981 has 4 divisors (see below), whose sum is σ = 277674382464. Its totient is φ = 260319733500.

The previous prime is 268997057977. The next prime is 268997057983. The reversal of 268997057981 is 189750799862.

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 268997057981 - 2² = 268997057977 is a prime.

It is a super-2 number, since 2×268997057981² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (268997057983) 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, 4338662195 + ... + 4338662256.

It is an arithmetic number, because the mean of its divisors is an integer number (69418595616).

Almost surely, 2^268997057981 is an apocalyptic number.

It is an amenable number.

268997057981 is a deficient number, since it is larger than the sum of its proper divisors (8677324483).

268997057981 is an equidigital number, since it uses as much as digits as its factorization.

268997057981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8677324482.

The product of its (nonzero) digits is 137168640, while the sum is 71.

The spelling of 268997057981 in words is "two hundred sixty-eight billion, nine hundred ninety-seven million, fifty-seven thousand, nine hundred eighty-one".