1155513281805 has 64 divisors (see below), whose sum is σ = 2085408944640. Its totient is φ = 606943411200.

The previous prime is 1155513281803. The next prime is 1155513281807. The reversal of 1155513281805 is 5081823155511.

1155513281805 is a `hidden beast` number, since 1 + 1 + 55 + 513 + 2 + 8 + 1 + 80 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (1155513281803) and next prime (1155513281807).

It is not a de Polignac number, because 1155513281805 - 2¹ = 1155513281803 is a prime.

It is a super-2 number, since 2×1155513281805² (a number of 25 digits) contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155513281801) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8955429 + ... + 9083541.

It is an arithmetic number, because the mean of its divisors is an integer number (32584514760).

Almost surely, 2^{1155513281805} is an apocalyptic number.

1155513281805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1155513281805 is a deficient number, since it is larger than the sum of its proper divisors (929895662835).

1155513281805 is a wasteful number, since it uses less digits than its factorization.

1155513281805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129139 (or 129133 counting only the distinct ones).

The product of its (nonzero) digits is 240000, while the sum is 45.

The spelling of 1155513281805 in words is "one trillion, one hundred fifty-five billion, five hundred thirteen million, two hundred eighty-one thousand, eight hundred five".