2601026503981 has 2 divisors, whose sum is σ = 2601026503982. Its totient is φ = 2601026503980.

The previous prime is 2601026503979. The next prime is 2601026504047. The reversal of 2601026503981 is 1893056201062.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2600833544100 + 192959881 = 1612710^2 + 13891^2 .

It is a cyclic number.

It is not a de Polignac number, because 2601026503981 - 2¹ = 2601026503979 is a prime.

It is a super-2 number, since 2×2601026503981² (a number of 26 digits) contains 22 as substring.

Together with 2601026503979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2601026503951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1300513251990 + 1300513251991.

It is an arithmetic number, because the mean of its divisors is an integer number (1300513251991).

Almost surely, 2^{2601026503981} is an apocalyptic number.

It is an amenable number.

2601026503981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2601026503981 is an equidigital number, since it uses as much as digits as its factorization.

2601026503981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 43.

The spelling of 2601026503981 in words is "two trillion, six hundred one billion, twenty-six million, five hundred three thousand, nine hundred eighty-one".