721255742340725 has 24 divisors (see below), whose sum is σ = 916364449520520. Its totient is φ = 562812269184000.

The previous prime is 721255742340659. The next prime is 721255742340733. The reversal of 721255742340725 is 527043247552127.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 575167884744964 + 146087857595761 = 23982658^2 + 12086681^2 .

It is not a de Polignac number, because 721255742340725 - 2¹⁰ = 721255742339701 is a prime.

It is a super-3 number, since 3×721255742340725³ (a number of 46 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69551606 + ... + 79246055.

It is an arithmetic number, because the mean of its divisors is an integer number (38181852063355).

Almost surely, 2^{721255742340725} is an apocalyptic number.

It is an amenable number.

721255742340725 is a deficient number, since it is larger than the sum of its proper divisors (195108707179795).

721255742340725 is a wasteful number, since it uses less digits than its factorization.

721255742340725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148802441 (or 148802436 counting only the distinct ones).

The product of its (nonzero) digits is 32928000, while the sum is 56.

The spelling of 721255742340725 in words is "seven hundred twenty-one trillion, two hundred fifty-five billion, seven hundred forty-two million, three hundred forty thousand, seven hundred twenty-five".