1605551291610 has 96 divisors (see below), whose sum is σ = 4482708780672. Its totient is φ = 366960908160.

The previous prime is 1605551291593. The next prime is 1605551291611. The reversal of 1605551291610 is 161921555061.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (1605551291611) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 45880320 + ... + 45915300.

It is an arithmetic number, because the mean of its divisors is an integer number (46694883132).

Almost surely, 2^{1605551291610} is an apocalyptic number.

1605551291610 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1605551291610 is an abundant number, since it is smaller than the sum of its proper divisors (2877157489062).

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

1605551291610 is a wasteful number, since it uses less digits than its factorization.

1605551291610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66228 (or 66221 counting only the distinct ones).

The product of its (nonzero) digits is 81000, while the sum is 42.

The spelling of 1605551291610 in words is "one trillion, six hundred five billion, five hundred fifty-one million, two hundred ninety-one thousand, six hundred ten".