2155308801409 has 27 divisors (see below), whose sum is σ = 2220568206787. Its totient is φ = 2091956011568.

The previous prime is 2155308801397. The next prime is 2155308801419. The reversal of 2155308801409 is 9041088035512.

The square root of 2155308801409 is 1468097.

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

It can be written as a sum of positive squares in only one way, i.e., 252509265009 + 1902799536400 = 502503^2 + 1379420^2 .

It is not a de Polignac number, because 2155308801409 - 2⁷ = 2155308801281 is a prime.

It is a super-2 number, since 2×2155308801409² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2155308801419) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 12906040644 + ... + 12906040810.

Almost surely, 2^{2155308801409} is an apocalyptic number.

2155308801409 is the 1468097-th square number.

2155308801409 is the 734049-th centered octagonal number.

It is an amenable number.

2155308801409 is a deficient number, since it is larger than the sum of its proper divisors (65259405378).

2155308801409 is an frugal number, since it uses more digits than its factorization.

2155308801409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 750 (or 375 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 46.

The spelling of 2155308801409 in words is "two trillion, one hundred fifty-five billion, three hundred eight million, eight hundred one thousand, four hundred nine".