655740409277 has 4 divisors (see below), whose sum is σ = 657426117660. Its totient is φ = 654054700896.

The previous prime is 655740409241. The next prime is 655740409327. The reversal of 655740409277 is 772904047556.

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

It can be written as a sum of positive squares in 2 ways, for example, as 91820514361 + 563919894916 = 303019^2 + 750946^2 .

It is a cyclic number.

It is not a de Polignac number, because 655740409277 - 2²⁶ = 655673300413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655740402277) 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, 842853608 + ... + 842854385.

It is an arithmetic number, because the mean of its divisors is an integer number (164356529415).

Almost surely, 2^655740409277 is an apocalyptic number.

It is an amenable number.

655740409277 is a deficient number, since it is larger than the sum of its proper divisors (1685708383).

655740409277 is a wasteful number, since it uses less digits than its factorization.

655740409277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1685708382.

The product of its (nonzero) digits is 14817600, while the sum is 56.

The spelling of 655740409277 in words is "six hundred fifty-five billion, seven hundred forty million, four hundred nine thousand, two hundred seventy-seven".