2775728605021 has 4 divisors (see below), whose sum is σ = 2776019358112. Its totient is φ = 2775437851932.

The previous prime is 2775728604991. The next prime is 2775728605049. The reversal of 2775728605021 is 1205068275772.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-2775728605021 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 2775728605021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2775728605621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 145362225 + ... + 145381318.

It is an arithmetic number, because the mean of its divisors is an integer number (694004839528).

Almost surely, 2^{2775728605021} is an apocalyptic number.

It is an amenable number.

2775728605021 is a deficient number, since it is larger than the sum of its proper divisors (290753091).

2775728605021 is an equidigital number, since it uses as much as digits as its factorization.

2775728605021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290753090.

The product of its (nonzero) digits is 3292800, while the sum is 52.

The spelling of 2775728605021 in words is "two trillion, seven hundred seventy-five billion, seven hundred twenty-eight million, six hundred five thousand, twenty-one".