725645068840 has 40 divisors (see below), whose sum is σ = 1637162337690. Its totient is φ = 289467133728.

The previous prime is 725645068807. The next prime is 725645068873. The reversal of 725645068840 is 48860546527.

It is an interprime number because it is at equal distance from previous prime (725645068807) and next prime (725645068873).

It can be written as a sum of positive squares in only one way, i.e., 653080561956 + 72564506884 = 808134^2 + 269378^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

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 9 ways as a sum of consecutive naturals, for example, 1977234337 + ... + 1977234703.

Almost surely, 2^725645068840 is an apocalyptic number.

It is an amenable number.

725645068840 is an abundant number, since it is smaller than the sum of its proper divisors (911517268850).

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

725645068840 is an frugal number, since it uses more digits than its factorization.

725645068840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1479 (or 374 counting only the distinct ones).

The product of its (nonzero) digits is 12902400, while the sum is 55.

The spelling of 725645068840 in words is "seven hundred twenty-five billion, six hundred forty-five million, sixty-eight thousand, eight hundred forty".