1645000009121 has 24 divisors (see below), whose sum is σ = 1965787482624. Its totient is φ = 1348356335040.

The previous prime is 1645000009067. The next prime is 1645000009151. The reversal of 1645000009121 is 1219000005461.

It is a de Polignac number, because none of the positive numbers 2^k-1645000009121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1645000009151) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15228461 + ... + 15336101.

It is an arithmetic number, because the mean of its divisors is an integer number (81907811776).

Almost surely, 2^{1645000009121} is an apocalyptic number.

It is an amenable number.

1645000009121 is a deficient number, since it is larger than the sum of its proper divisors (320787473503).

1645000009121 is a wasteful number, since it uses less digits than its factorization.

1645000009121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111821 (or 111798 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 29.

The spelling of 1645000009121 in words is "one trillion, six hundred forty-five billion, nine thousand, one hundred twenty-one".