78182581572 has 18 divisors (see below), whose sum is σ = 197628192398. Its totient is φ = 26060860512.

The previous prime is 78182581541. The next prime is 78182581583. The reversal of 78182581572 is 27518528187.

78182581572 is a `hidden beast` number, since 7 + 8 + 1 + 8 + 2 + 581 + 57 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 78112424196 + 70157376 = 279486^2 + 8376^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×78182581572² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1085869153 + ... + 1085869224.

Almost surely, 2^78182581572 is an apocalyptic number.

It is an amenable number.

78182581572 is an abundant number, since it is smaller than the sum of its proper divisors (119445610826).

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

78182581572 is a wasteful number, since it uses less digits than its factorization.

78182581572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2171738387 (or 2171738382 counting only the distinct ones).

The product of its digits is 2508800, while the sum is 54.

The spelling of 78182581572 in words is "seventy-eight billion, one hundred eighty-two million, five hundred eighty-one thousand, five hundred seventy-two".