2670880721 has 2 divisors, whose sum is σ = 2670880722. Its totient is φ = 2670880720.

The previous prime is 2670880699. The next prime is 2670880747. The reversal of 2670880721 is 1270880762.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1769380096 + 901500625 = 42064^2 + 30025^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2670880721 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2670880621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1335440360 + 1335440361.

It is an arithmetic number, because the mean of its divisors is an integer number (1335440361).

Almost surely, 2^2670880721 is an apocalyptic number.

It is an amenable number.

2670880721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2670880721 is an equidigital number, since it uses as much as digits as its factorization.

2670880721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75264, while the sum is 41.

The square root of 2670880721 is about 51680.5642480807. The cubic root of 2670880721 is about 1387.4526297817.

Adding to 2670880721 its sum of digits (41), we get a palindrome (2670880762).

The spelling of 2670880721 in words is "two billion, six hundred seventy million, eight hundred eighty thousand, seven hundred twenty-one".