1155974996736 has 864 divisors, whose sum is σ = 4167304747200. Its totient is φ = 318670184448.

The previous prime is 1155974996731. The next prime is 1155974996789. The reversal of 1155974996736 is 6376994795511.

It is a happy number.

1155974996736 is a `hidden beast` number, since 1 + 1 + 559 + 7 + 4 + 9 + 9 + 67 + 3 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (864).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is not an unprimeable number, because it can be changed into a prime (1155974996731) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 795577386 + ... + 795578838.

Almost surely, 2^{1155974996736} is an apocalyptic number.

1155974996736 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1155974996736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2083652373600).

1155974996736 is an abundant number, since it is smaller than the sum of its proper divisors (3011329750464).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1155974996736 is an frugal number, since it uses more digits than its factorization.

1155974996736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1533 (or 1494 counting only the distinct ones).

The product of its digits is 385786800, while the sum is 72.

The spelling of 1155974996736 in words is "one trillion, one hundred fifty-five billion, nine hundred seventy-four million, nine hundred ninety-six thousand, seven hundred thirty-six".