725126457640 has 64 divisors (see below), whose sum is σ = 1757396768400. Its totient is φ = 267684206592.

The previous prime is 725126457631. The next prime is 725126457691. The reversal of 725126457640 is 46754621527.

It can be written as a sum of positive squares in 8 ways, for example, as 52605092164 + 672521365476 = 229358^2 + 820074^2 .

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, 2445756 + ... + 2726164.

Almost surely, 2^725126457640 is an apocalyptic number.

It is an amenable number.

725126457640 is an abundant number, since it is smaller than the sum of its proper divisors (1032270310760).

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

725126457640 is a wasteful number, since it uses less digits than its factorization.

725126457640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285406 (or 285402 counting only the distinct ones).

The product of its (nonzero) digits is 2822400, while the sum is 49.

The spelling of 725126457640 in words is "seven hundred twenty-five billion, one hundred twenty-six million, four hundred fifty-seven thousand, six hundred forty".