655121303121556 has 12 divisors (see below), whose sum is σ = 1165256744077300. Its totient is φ = 322190804813760.

The previous prime is 655121303121499. The next prime is 655121303121569.

655121303121556 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 7032923665156 + 648088379456400 = 2651966^2 + 25457580^2 .

It is a super-2 number, since 2×655121303121556² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1342461686481 + ... + 1342461686968.

Almost surely, 2^{655121303121556} is an apocalyptic number.

It is an amenable number.

655121303121556 is a deficient number, since it is larger than the sum of its proper divisors (510135440955744).

655121303121556 is a wasteful number, since it uses less digits than its factorization.

655121303121556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2684923373514 (or 2684923373512 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 46.

It can be divided in two parts, 65512130 and 3121556, that added together give a palindrome (68633686).

The spelling of 655121303121556 in words is "six hundred fifty-five trillion, one hundred twenty-one billion, three hundred three million, one hundred twenty-one thousand, five hundred fifty-six".