2640577897 has 2 divisors, whose sum is σ = 2640577898. Its totient is φ = 2640577896.

The previous prime is 2640577871. The next prime is 2640577913. The reversal of 2640577897 is 7987750462.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2631792601 + 8785296 = 51301^2 + 2964^2 .

It is a cyclic number.

It is not a de Polignac number, because 2640577897 - 2⁷ = 2640577769 is a prime.

It is a super-3 number, since 3×2640577897³ (a number of 29 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (2640577847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1320288948 + 1320288949.

It is an arithmetic number, because the mean of its divisors is an integer number (1320288949).

Almost surely, 2^2640577897 is an apocalyptic number.

It is an amenable number.

2640577897 is a deficient number, since it is larger than the sum of its proper divisors (1).

2640577897 is an equidigital number, since it uses as much as digits as its factorization.

2640577897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5927040, while the sum is 55.

The square root of 2640577897 is about 51386.5536594935. The cubic root of 2640577897 is about 1382.1854849289.

The spelling of 2640577897 in words is "two billion, six hundred forty million, five hundred seventy-seven thousand, eight hundred ninety-seven".