78641601552 has 30 divisors (see below), whose sum is σ = 220087260302. Its totient is φ = 26213867136.

The previous prime is 78641601523. The next prime is 78641601557. The reversal of 78641601552 is 25510614687.

78641601552 is a `hidden beast` number, since 7 + 86 + 4 + 16 + 0 + 1 + 552 = 666.

It can be written as a sum of positive squares in only one way, i.e., 51047076096 + 27594525456 = 225936^2 + 166116^2 .

It is a junction number, because it is equal to n+sod(n) for n = 78641601498 and 78641601507.

It is not an unprimeable number, because it can be changed into a prime (78641601557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 273060973 + ... + 273061260.

Almost surely, 2^78641601552 is an apocalyptic number.

78641601552 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

78641601552 is an abundant number, since it is smaller than the sum of its proper divisors (141445658750).

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

78641601552 is a wasteful number, since it uses less digits than its factorization.

78641601552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546122247 (or 546122238 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 45.

The spelling of 78641601552 in words is "seventy-eight billion, six hundred forty-one million, six hundred one thousand, five hundred fifty-two".