1147921257656 has 32 divisors (see below), whose sum is σ = 2161458129600. Its totient is φ = 571535617920.

The previous prime is 1147921257611. The next prime is 1147921257683. The reversal of 1147921257656 is 6567521297411.

It is a super-2 number, since 2×1147921257656² (a number of 25 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 (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2686550 + ... + 3084378.

It is an arithmetic number, because the mean of its divisors is an integer number (67545566550).

Almost surely, 2^{1147921257656} is an apocalyptic number.

It is an amenable number.

1147921257656 is a deficient number, since it is larger than the sum of its proper divisors (1013536871944).

1147921257656 is a wasteful number, since it uses less digits than its factorization.

1147921257656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399359 (or 399355 counting only the distinct ones).

The product of its digits is 6350400, while the sum is 56.

The spelling of 1147921257656 in words is "one trillion, one hundred forty-seven billion, nine hundred twenty-one million, two hundred fifty-seven thousand, six hundred fifty-six".