245587067981 has 2 divisors, whose sum is σ = 245587067982. Its totient is φ = 245587067980.

The previous prime is 245587067963. The next prime is 245587068031. The reversal of 245587067981 is 189760785542.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 154790312356 + 90796755625 = 393434^2 + 301325^2 .

It is a cyclic number.

It is not a de Polignac number, because 245587067981 - 2⁶ = 245587067917 is a prime.

It is a super-2 number, since 2×245587067981² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (245587067681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122793533990 + 122793533991.

It is an arithmetic number, because the mean of its divisors is an integer number (122793533991).

Almost surely, 2^245587067981 is an apocalyptic number.

It is an amenable number.

245587067981 is a deficient number, since it is larger than the sum of its proper divisors (1).

245587067981 is an equidigital number, since it uses as much as digits as its factorization.

245587067981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 33868800, while the sum is 62.

The spelling of 245587067981 in words is "two hundred forty-five billion, five hundred eighty-seven million, sixty-seven thousand, nine hundred eighty-one".