55319831280 has 400 divisors, whose sum is σ = 223192542144. Its totient is φ = 12436623360.

The previous prime is 55319831279. The next prime is 55319831327. The reversal of 55319831280 is 8213891355.

55319831280 is a `hidden beast` number, since 5 + 531 + 9 + 8 + 31 + 2 + 80 = 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 79 ways as a sum of consecutive naturals, for example, 2756964 + ... + 2776956.

Almost surely, 2^55319831280 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55319831280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111596271072).

55319831280 is an abundant number, since it is smaller than the sum of its proper divisors (167872710864).

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

55319831280 is a wasteful number, since it uses less digits than its factorization.

55319831280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20086 (or 20071 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 45.

The spelling of 55319831280 in words is "fifty-five billion, three hundred nineteen million, eight hundred thirty-one thousand, two hundred eighty".