718530661520 has 80 divisors (see below), whose sum is σ = 1927775066880. Its totient is φ = 243961569792.

The previous prime is 718530661501. The next prime is 718530661543. The reversal of 718530661520 is 25166035817.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6170915 + ... + 6286274.

It is an arithmetic number, because the mean of its divisors is an integer number (24097188336).

Almost surely, 2^718530661520 is an apocalyptic number.

718530661520 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

718530661520 is an abundant number, since it is smaller than the sum of its proper divisors (1209244405360).

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

718530661520 is a wasteful number, since it uses less digits than its factorization.

718530661520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12457312 (or 12457306 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 44.

The spelling of 718530661520 in words is "seven hundred eighteen billion, five hundred thirty million, six hundred sixty-one thousand, five hundred twenty".