3645545123550 has 96 divisors (see below), whose sum is σ = 9870340043520. Its totient is φ = 883097958400.

The previous prime is 3645545123543. The next prime is 3645545123557. The reversal of 3645545123550 is 553215455463.

It is an interprime number because it is at equal distance from previous prime (3645545123543) and next prime (3645545123557).

It is a self number, because there is not a number n which added to its sum of digits gives 3645545123550.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3645545123557) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1338814 + ... + 3013886.

It is an arithmetic number, because the mean of its divisors is an integer number (102816042120).

Almost surely, 2^{3645545123550} is an apocalyptic number.

3645545123550 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 3645545123550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4935170021760).

3645545123550 is an abundant number, since it is smaller than the sum of its proper divisors (6224794919970).

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

3645545123550 is a wasteful number, since it uses less digits than its factorization.

3645545123550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1676418 (or 1676413 counting only the distinct ones).

The product of its (nonzero) digits is 5400000, while the sum is 48.

The spelling of 3645545123550 in words is "three trillion, six hundred forty-five billion, five hundred forty-five million, one hundred twenty-three thousand, five hundred fifty".