1645237574500 has 96 divisors (see below), whose sum is σ = 3889047052800. Its totient is φ = 604419235200.

The previous prime is 1645237574483. The next prime is 1645237574503. The reversal of 1645237574500 is 54757325461.

It is not an unprimeable number, because it can be changed into a prime (1645237574503) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 657537 + ... + 1929463.

It is an arithmetic number, because the mean of its divisors is an integer number (40510906800).

Almost surely, 2^{1645237574500} is an apocalyptic number.

1645237574500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1645237574500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1944523526400).

1645237574500 is an abundant number, since it is smaller than the sum of its proper divisors (2243809478300).

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

1645237574500 is a wasteful number, since it uses less digits than its factorization.

1645237574500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1272158 (or 1272146 counting only the distinct ones).

The product of its (nonzero) digits is 3528000, while the sum is 49.

The spelling of 1645237574500 in words is "one trillion, six hundred forty-five billion, two hundred thirty-seven million, five hundred seventy-four thousand, five hundred".