1155321747540 has 36 divisors (see below), whose sum is σ = 3504475968084. Its totient is φ = 308085799296.

The previous prime is 1155321747479. The next prime is 1155321747553. The reversal of 1155321747540 is 457471235511.

1155321747540 is a `hidden beast` number, since 1 + 1 + 5 + 5 + 32 + 1 + 74 + 7 + 540 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 736637692176 + 418684055364 = 858276^2 + 647058^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3209226897 + ... + 3209227256.

It is an arithmetic number, because the mean of its divisors is an integer number (97346554669).

Almost surely, 2^{1155321747540} is an apocalyptic number.

1155321747540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1155321747540 is an abundant number, since it is smaller than the sum of its proper divisors (2349154220544).

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

1155321747540 is a wasteful number, since it uses less digits than its factorization.

1155321747540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6418454168 (or 6418454163 counting only the distinct ones).

The product of its (nonzero) digits is 588000, while the sum is 45.

The spelling of 1155321747540 in words is "one trillion, one hundred fifty-five billion, three hundred twenty-one million, seven hundred forty-seven thousand, five hundred forty".