1625722554420 has 240 divisors, whose sum is σ = 5226838016400. Its totient is φ = 422750085120.

The previous prime is 1625722554419. The next prime is 1625722554497. The reversal of 1625722554420 is 244552275261.

1625722554420 is a `hidden beast` number, since 1 + 6 + 2 + 5 + 72 + 2 + 554 + 4 + 20 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 2865675024 + 1622856879396 = 53532^2 + 1273914^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 181255696 + ... + 181264664.

It is an arithmetic number, because the mean of its divisors is an integer number (21778491735).

Almost surely, 2^{1625722554420} is an apocalyptic number.

1625722554420 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 1625722554420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2613419008200).

1625722554420 is an abundant number, since it is smaller than the sum of its proper divisors (3601115461980).

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

1625722554420 is a wasteful number, since it uses less digits than its factorization.

1625722554420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11760 (or 11749 counting only the distinct ones).

The product of its (nonzero) digits is 1344000, while the sum is 45.

The spelling of 1625722554420 in words is "one trillion, six hundred twenty-five billion, seven hundred twenty-two million, five hundred fifty-four thousand, four hundred twenty".