1325612564661 has 24 divisors (see below), whose sum is σ = 2220309754432. Its totient is φ = 688629902400.

The previous prime is 1325612564657. The next prime is 1325612564671. The reversal of 1325612564661 is 1664652165231.

It is a happy number.

It is not a de Polignac number, because 1325612564661 - 2² = 1325612564657 is a prime.

It is a super-2 number, since 2×1325612564661² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1325612564661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1325612564641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 260842120 + ... + 260847201.

Almost surely, 2^{1325612564661} is an apocalyptic number.

1325612564661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1325612564661 is a deficient number, since it is larger than the sum of its proper divisors (894697189771).

1325612564661 is a wasteful number, since it uses less digits than its factorization.

1325612564661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521689353 (or 521689342 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 48.

The spelling of 1325612564661 in words is "one trillion, three hundred twenty-five billion, six hundred twelve million, five hundred sixty-four thousand, six hundred sixty-one".