1555155261660 has 288 divisors, whose sum is σ = 5878640420352. Its totient is φ = 298291368960.

The previous prime is 1555155261643. The next prime is 1555155261683. The reversal of 1555155261660 is 661625515551.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 215119 + ... + 1776678.

It is an arithmetic number, because the mean of its divisors is an integer number (20411945904).

Almost surely, 2^{1555155261660} is an apocalyptic number.

1555155261660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1555155261660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2939320210176).

1555155261660 is an abundant number, since it is smaller than the sum of its proper divisors (4323485158692).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1555155261660 is a wasteful number, since it uses less digits than its factorization.

1555155261660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1991853 (or 1991838 counting only the distinct ones).

The product of its (nonzero) digits is 1350000, while the sum is 48.

The spelling of 1555155261660 in words is "one trillion, five hundred fifty-five billion, one hundred fifty-five million, two hundred sixty-one thousand, six hundred sixty".