1625218543620 has 216 divisors, whose sum is σ = 5745316770648. Its totient is φ = 370790784000.

The previous prime is 1625218543601. The next prime is 1625218543621. The reversal of 1625218543620 is 263458125261.

1625218543620 is a `hidden beast` number, since 1 + 6 + 2 + 5 + 2 + 18 + 5 + 4 + 3 + 620 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 23616927684 + 1601601615936 = 153678^2 + 1265544^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (1625218543621) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 4601320 + ... + 4941920.

It is an arithmetic number, because the mean of its divisors is an integer number (26598688753).

Almost surely, 2^{1625218543620} is an apocalyptic number.

1625218543620 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 1625218543620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2872658385324).

1625218543620 is an abundant number, since it is smaller than the sum of its proper divisors (4120098227028).

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

1625218543620 is a wasteful number, since it uses less digits than its factorization.

1625218543620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341171 (or 341159 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 45.

The spelling of 1625218543620 in words is "one trillion, six hundred twenty-five billion, two hundred eighteen million, five hundred forty-three thousand, six hundred twenty".