165451513656 has 256 divisors, whose sum is σ = 515397012480. Its totient is φ = 43540992000.

The previous prime is 165451513597. The next prime is 165451513681. The reversal of 165451513656 is 656315154561.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4797916 + ... + 4832276.

It is an arithmetic number, because the mean of its divisors is an integer number (2013269580).

Almost surely, 2^165451513656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 165451513656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (257698506240).

165451513656 is an abundant number, since it is smaller than the sum of its proper divisors (349945498824).

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

165451513656 is a wasteful number, since it uses less digits than its factorization.

165451513656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34478 (or 34474 counting only the distinct ones).

The product of its digits is 1620000, while the sum is 48.

The spelling of 165451513656 in words is "one hundred sixty-five billion, four hundred fifty-one million, five hundred thirteen thousand, six hundred fifty-six".