155665011606 has 64 divisors (see below), whose sum is σ = 337657033728. Its totient is φ = 47557772928.

The previous prime is 155665011599. The next prime is 155665011611. The reversal of 155665011606 is 606110566551.

It is a super-2 number, since 2×155665011606² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12798480 + ... + 12810636.

It is an arithmetic number, because the mean of its divisors is an integer number (5275891152).

Almost surely, 2^155665011606 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155665011606, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (168828516864).

155665011606 is an abundant number, since it is smaller than the sum of its proper divisors (181992022122).

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

155665011606 is a wasteful number, since it uses less digits than its factorization.

155665011606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13325.

The product of its (nonzero) digits is 162000, while the sum is 42.

The spelling of 155665011606 in words is "one hundred fifty-five billion, six hundred sixty-five million, eleven thousand, six hundred six".