2661280071 has 4 divisors (see below), whose sum is σ = 3548373432. Its totient is φ = 1774186712.

The previous prime is 2661280003. The next prime is 2661280073. The reversal of 2661280071 is 1700821662.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2661280071 - 2²⁶ = 2594171207 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661280073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 443546676 + ... + 443546681.

It is an arithmetic number, because the mean of its divisors is an integer number (887093358).

Almost surely, 2^2661280071 is an apocalyptic number.

2661280071 is a deficient number, since it is larger than the sum of its proper divisors (887093361).

2661280071 is an equidigital number, since it uses as much as digits as its factorization.

2661280071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 887093360.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 2661280071 is about 51587.5960963486. The cubic root of 2661280071 is about 1385.7882050932.

The spelling of 2661280071 in words is "two billion, six hundred sixty-one million, two hundred eighty thousand, seventy-one".