2695021561 has 4 divisors (see below), whose sum is σ = 2702365312. Its totient is φ = 2687677812.

The previous prime is 2695021547. The next prime is 2695021613. The reversal of 2695021561 is 1651205962.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2695021561 - 2²⁹ = 2158150649 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2695021561.

It is not an unprimeable number, because it can be changed into a prime (2695021531) 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, 3671325 + ... + 3672058.

It is an arithmetic number, because the mean of its divisors is an integer number (675591328).

Almost surely, 2^2695021561 is an apocalyptic number.

It is an amenable number.

2695021561 is a deficient number, since it is larger than the sum of its proper divisors (7343751).

2695021561 is an equidigital number, since it uses as much as digits as its factorization.

2695021561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7343750.

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 2695021561 is about 51913.5970724434. The cubic root of 2695021561 is about 1391.6202766007.

The spelling of 2695021561 in words is "two billion, six hundred ninety-five million, twenty-one thousand, five hundred sixty-one".