1538455057920 has 800 divisors, whose sum is σ = 6110289336096. Its totient is φ = 366811545600.

The previous prime is 1538455057901. The next prime is 1538455057921. The reversal of 1538455057920 is 297505548351.

1538455057920 is a `hidden beast` number, since 1 + 5 + 3 + 8 + 45 + 5 + 0 + 579 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1538455057921) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 139133032 + ... + 139144088.

Almost surely, 2^{1538455057920} is an apocalyptic number.

1538455057920 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 1538455057920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3055144668048).

1538455057920 is an abundant number, since it is smaller than the sum of its proper divisors (4571834278176).

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

1538455057920 is a wasteful number, since it uses less digits than its factorization.

1538455057920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11164 (or 11139 counting only the distinct ones).

The product of its (nonzero) digits is 7560000, while the sum is 54.

The spelling of 1538455057920 in words is "one trillion, five hundred thirty-eight billion, four hundred fifty-five million, fifty-seven thousand, nine hundred twenty".