2581651397077 has 2 divisors, whose sum is σ = 2581651397078. Its totient is φ = 2581651397076.

The previous prime is 2581651397053. The next prime is 2581651397161. The reversal of 2581651397077 is 7707931561852.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1952039299716 + 629612097361 = 1397154^2 + 793481^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2581651397077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2581651377077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1290825698538 + 1290825698539.

It is an arithmetic number, because the mean of its divisors is an integer number (1290825698539).

Almost surely, 2^{2581651397077} is an apocalyptic number.

It is an amenable number.

2581651397077 is a deficient number, since it is larger than the sum of its proper divisors (1).

2581651397077 is an equidigital number, since it uses as much as digits as its factorization.

2581651397077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22226400, while the sum is 61.

The spelling of 2581651397077 in words is "two trillion, five hundred eighty-one billion, six hundred fifty-one million, three hundred ninety-seven thousand, seventy-seven".