1155163655421 has 6 divisors (see below), whose sum is σ = 1668569724510. Its totient is φ = 770109103608.

The previous prime is 1155163655419. The next prime is 1155163655441. The reversal of 1155163655421 is 1245563615511.

1155163655421 is a `hidden beast` number, since 1 + 1 + 5 + 5 + 1 + 636 + 5 + 5 + 4 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1075190643396 + 79973012025 = 1036914^2 + 282795^2 .

It is not a de Polignac number, because 1155163655421 - 2¹ = 1155163655419 is a prime.

It is a super-3 number, since 3×1155163655421³ (a number of 37 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155163655441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 64175758626 + ... + 64175758643.

It is an arithmetic number, because the mean of its divisors is an integer number (278094954085).

Almost surely, 2^{1155163655421} is an apocalyptic number.

It is an amenable number.

1155163655421 is a deficient number, since it is larger than the sum of its proper divisors (513406069089).

1155163655421 is a wasteful number, since it uses less digits than its factorization.

1155163655421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128351517275 (or 128351517272 counting only the distinct ones).

The product of its digits is 540000, while the sum is 45.

The spelling of 1155163655421 in words is "one trillion, one hundred fifty-five billion, one hundred sixty-three million, six hundred fifty-five thousand, four hundred twenty-one".