78518526440 has 16 divisors (see below), whose sum is σ = 176666684580. Its totient is φ = 31407410560.

The previous prime is 78518526371. The next prime is 78518526481. The reversal of 78518526440 is 4462581587.

It can be written as a sum of positive squares in 2 ways, for example, as 74569409476 + 3949116964 = 273074^2 + 62842^2 .

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 3 ways as a sum of consecutive naturals, for example, 981481541 + ... + 981481620.

Almost surely, 2^78518526440 is an apocalyptic number.

It is an amenable number.

78518526440 is an abundant number, since it is smaller than the sum of its proper divisors (98148158140).

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

78518526440 is a wasteful number, since it uses less digits than its factorization.

78518526440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1962963172 (or 1962963168 counting only the distinct ones).

The product of its (nonzero) digits is 2150400, while the sum is 50.

The spelling of 78518526440 in words is "seventy-eight billion, five hundred eighteen million, five hundred twenty-six thousand, four hundred forty".