2145423245501 has 4 divisors (see below), whose sum is σ = 2146221099900. Its totient is φ = 2144625391104.

The previous prime is 2145423245491. The next prime is 2145423245551. The reversal of 2145423245501 is 1055423245412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 389663092900 + 1755760152601 = 624230^2 + 1325051^2 .

It is a cyclic number.

It is not a de Polignac number, because 2145423245501 - 2³⁰ = 2144349503677 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145423245551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 398923166 + ... + 398928543.

It is an arithmetic number, because the mean of its divisors is an integer number (536555274975).

Almost surely, 2^{2145423245501} is an apocalyptic number.

It is an amenable number.

2145423245501 is a deficient number, since it is larger than the sum of its proper divisors (797854399).

2145423245501 is an equidigital number, since it uses as much as digits as its factorization.

2145423245501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 797854398.

The product of its (nonzero) digits is 192000, while the sum is 38.

The spelling of 2145423245501 in words is "two trillion, one hundred forty-five billion, four hundred twenty-three million, two hundred forty-five thousand, five hundred one".