1645300726121 has 16 divisors (see below), whose sum is σ = 1881623735040. Its totient is φ = 1426072677120.

The previous prime is 1645300726081. The next prime is 1645300726133. The reversal of 1645300726121 is 1216270035461.

It is not a de Polignac number, because 1645300726121 - 2³⁰ = 1644226984297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1645300726021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29446145 + ... + 29501966.

It is an arithmetic number, because the mean of its divisors is an integer number (117601483440).

Almost surely, 2^{1645300726121} is an apocalyptic number.

It is an amenable number.

1645300726121 is a deficient number, since it is larger than the sum of its proper divisors (236323008919).

1645300726121 is a wasteful number, since it uses less digits than its factorization.

1645300726121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58948256.

The product of its (nonzero) digits is 60480, while the sum is 38.

The spelling of 1645300726121 in words is "one trillion, six hundred forty-five billion, three hundred million, seven hundred twenty-six thousand, one hundred twenty-one".