1645006123265 has 32 divisors (see below), whose sum is σ = 2025663927936. Its totient is φ = 1281744414720.

The previous prime is 1645006123237. The next prime is 1645006123283. The reversal of 1645006123265 is 5623216005461.

It is a happy number.

It is not a de Polignac number, because 1645006123265 - 2²⁶ = 1644939014401 is a prime.

It is a Duffinian 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, 364501649 + ... + 364506161.

It is an arithmetic number, because the mean of its divisors is an integer number (63301997748).

Almost surely, 2^{1645006123265} is an apocalyptic number.

It is an amenable number.

1645006123265 is a deficient number, since it is larger than the sum of its proper divisors (380657804671).

1645006123265 is a wasteful number, since it uses less digits than its factorization.

1645006123265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9009.

The product of its (nonzero) digits is 259200, while the sum is 41.

The spelling of 1645006123265 in words is "one trillion, six hundred forty-five billion, six million, one hundred twenty-three thousand, two hundred sixty-five".