65881135530 has 144 divisors (see below), whose sum is σ = 199365753600. Its totient is φ = 15050314944.

The previous prime is 65881135517. The next prime is 65881135549. The reversal of 65881135530 is 3553118856.

65881135530 is a `hidden beast` number, since 6 + 5 + 8 + 81 + 1 + 35 + 530 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 12199771 + ... + 12205169.

It is an arithmetic number, because the mean of its divisors is an integer number (1384484400).

Almost surely, 2^65881135530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65881135530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99682876800).

65881135530 is an abundant number, since it is smaller than the sum of its proper divisors (133484618070).

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

65881135530 is a wasteful number, since it uses less digits than its factorization.

65881135530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8193 (or 8183 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 45.

The spelling of 65881135530 in words is "sixty-five billion, eight hundred eighty-one million, one hundred thirty-five thousand, five hundred thirty".