655765569397 has 4 divisors (see below), whose sum is σ = 671015931520. Its totient is φ = 640515207276.

The previous prime is 655765569391. The next prime is 655765569409. The reversal of 655765569397 is 793965567556.

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-655765569397 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 (655765569391) 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, 7625180997 + ... + 7625181082.

It is an arithmetic number, because the mean of its divisors is an integer number (167753982880).

Almost surely, 2^655765569397 is an apocalyptic number.

It is an amenable number.

655765569397 is a deficient number, since it is larger than the sum of its proper divisors (15250362123).

655765569397 is a wasteful number, since it uses less digits than its factorization.

655765569397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15250362122.

The product of its digits is 1607445000, while the sum is 73.

The spelling of 655765569397 in words is "six hundred fifty-five billion, seven hundred sixty-five million, five hundred sixty-nine thousand, three hundred ninety-seven".