2657845991 has 2 divisors, whose sum is σ = 2657845992. Its totient is φ = 2657845990.

The previous prime is 2657845903. The next prime is 2657846047. The reversal of 2657845991 is 1995487562.

It is an a-pointer prime, because the next prime (2657846047) can be obtained adding 2657845991 to its sum of digits (56).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2657845991 - 2¹⁸ = 2657583847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2657845291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1328922995 + 1328922996.

It is an arithmetic number, because the mean of its divisors is an integer number (1328922996).

Almost surely, 2^2657845991 is an apocalyptic number.

2657845991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2657845991 is an equidigital number, since it uses as much as digits as its factorization.

2657845991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5443200, while the sum is 56.

The square root of 2657845991 is about 51554.3013821349. The cubic root of 2657845991 is about 1385.1918810381.

The spelling of 2657845991 in words is "two billion, six hundred fifty-seven million, eight hundred forty-five thousand, nine hundred ninety-one".