1645317052220 has 24 divisors (see below), whose sum is σ = 3566622772608. Its totient is φ = 636896923200.

The previous prime is 1645317052217. The next prime is 1645317052229. The reversal of 1645317052220 is 222507135461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645317052229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1326867971 + ... + 1326869210.

It is an arithmetic number, because the mean of its divisors is an integer number (148609282192).

Almost surely, 2^{1645317052220} is an apocalyptic number.

1645317052220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1645317052220 is an abundant number, since it is smaller than the sum of its proper divisors (1921305720388).

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

1645317052220 is a wasteful number, since it uses less digits than its factorization.

1645317052220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2653737221 (or 2653737219 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 38.

The spelling of 1645317052220 in words is "one trillion, six hundred forty-five billion, three hundred seventeen million, fifty-two thousand, two hundred twenty".