8555137920 has 512 divisors, whose sum is σ = 35004441600. Its totient is φ = 1934254080.

The previous prime is 8555137907. The next prime is 8555137951. The reversal of 8555137920 is 297315558.

8555137920 is a `hidden beast` number, since 8 + 5 + 551 + 3 + 7 + 92 + 0 = 666.

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 63 ways as a sum of consecutive naturals, for example, 12942390 + ... + 12943050.

It is an arithmetic number, because the mean of its divisors is an integer number (68368050).

Almost surely, 2^8555137920 is an apocalyptic number.

8555137920 is a gapful number since it is divisible by the number (80) 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 8555137920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17502220800).

8555137920 is an abundant number, since it is smaller than the sum of its proper divisors (26449303680).

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

8555137920 is a wasteful number, since it uses less digits than its factorization.

8555137920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 803 (or 785 counting only the distinct ones).

The product of its (nonzero) digits is 378000, while the sum is 45.

The square root of 8555137920 is about 92493.9885614195. The cubic root of 8555137920 is about 2045.2308664659.

The spelling of 8555137920 in words is "eight billion, five hundred fifty-five million, one hundred thirty-seven thousand, nine hundred twenty".