155618664027841 has 9 divisors (see below), whose sum is σ = 181025894428641. Its totient is φ = 133387351461252.

The previous prime is 155618664027821. The next prime is 155618664027859. The reversal of 155618664027841 is 148720466816551.

The square root of 155618664027841 is 12474721.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 155618664027841 - 2⁷ = 155618664027713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155618664027821) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 86431996 + ... + 88214098.

It is an arithmetic number, because the mean of its divisors is an integer number (20113988269849).

Almost surely, 2^{155618664027841} is an apocalyptic number.

155618664027841 is the 12474721-st square number.

155618664027841 is the 6237361-st centered octagonal number.

It is an amenable number.

155618664027841 is a deficient number, since it is larger than the sum of its proper divisors (25407230400800).

155618664027841 is an frugal number, since it uses more digits than its factorization.

155618664027841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3564220 (or 1782110 counting only the distinct ones).

The product of its (nonzero) digits is 77414400, while the sum is 64.

The spelling of 155618664027841 in words is "one hundred fifty-five trillion, six hundred eighteen billion, six hundred sixty-four million, twenty-seven thousand, eight hundred forty-one".