1155171356901 has 6 divisors (see below), whose sum is σ = 1668580848870. Its totient is φ = 770114237928.

The previous prime is 1155171356821. The next prime is 1155171356959. The reversal of 1155171356901 is 1096531715511.

1155171356901 is a `hidden beast` number, since 1 + 1 + 551 + 7 + 1 + 3 + 5 + 6 + 90 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 688279299876 + 466892057025 = 829626^2 + 683295^2 .

It is not a de Polignac number, because 1155171356901 - 2⁹ = 1155171356389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155171356971) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 64176186486 + ... + 64176186503.

It is an arithmetic number, because the mean of its divisors is an integer number (278096808145).

Almost surely, 2^{1155171356901} is an apocalyptic number.

It is an amenable number.

1155171356901 is a deficient number, since it is larger than the sum of its proper divisors (513409491969).

1155171356901 is a wasteful number, since it uses less digits than its factorization.

1155171356901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128352372995 (or 128352372992 counting only the distinct ones).

The product of its (nonzero) digits is 141750, while the sum is 45.

The spelling of 1155171356901 in words is "one trillion, one hundred fifty-five billion, one hundred seventy-one million, three hundred fifty-six thousand, nine hundred one".