665527778058 has 128 divisors (see below), whose sum is σ = 1591965010944. Its totient is φ = 182832998400.

The previous prime is 665527778053. The next prime is 665527778063. The reversal of 665527778058 is 850877725566.

It is an interprime number because it is at equal distance from previous prime (665527778053) and next prime (665527778063).

It is a super-3 number, since 3×665527778058³ (a number of 36 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a self number, because there is not a number n which added to its sum of digits gives 665527778058.

It is not an unprimeable number, because it can be changed into a prime (665527778053) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 10872085 + ... + 10933127.

It is an arithmetic number, because the mean of its divisors is an integer number (12437226648).

Almost surely, 2^665527778058 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665527778058, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (795982505472).

665527778058 is an abundant number, since it is smaller than the sum of its proper divisors (926437232886).

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

665527778058 is a wasteful number, since it uses less digits than its factorization.

665527778058 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61300.

The product of its (nonzero) digits is 197568000, while the sum is 66.

The spelling of 665527778058 in words is "six hundred sixty-five billion, five hundred twenty-seven million, seven hundred seventy-eight thousand, fifty-eight".