1605215656902 has 128 divisors (see below), whose sum is σ = 4048268958720. Its totient is φ = 416809635840.

The previous prime is 1605215656901. The next prime is 1605215656907. The reversal of 1605215656902 is 2096565125061.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1605215656901) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 310999 + ... + 1818557.

It is an arithmetic number, because the mean of its divisors is an integer number (31627101240).

Almost surely, 2^{1605215656902} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1605215656902, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2024134479360).

1605215656902 is an abundant number, since it is smaller than the sum of its proper divisors (2443053301818).

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

1605215656902 is a wasteful number, since it uses less digits than its factorization.

1605215656902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1507678.

The product of its (nonzero) digits is 972000, while the sum is 48.

The spelling of 1605215656902 in words is "one trillion, six hundred five billion, two hundred fifteen million, six hundred fifty-six thousand, nine hundred two".