725420321641 has 4 divisors (see below), whose sum is σ = 726104036484. Its totient is φ = 724736606800.

The previous prime is 725420321629. The next prime is 725420321707. The reversal of 725420321641 is 146123024527.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 146123024527 = 17 ⋅8595472031.

It can be written as a sum of positive squares in 2 ways, for example, as 243735740416 + 481684581225 = 493696^2 + 694035^2 .

It is a cyclic number.

It is not a de Polignac number, because 725420321641 - 2⁷ = 725420321513 is a prime.

It is a super-3 number, since 3×725420321641³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 725420321641.

It is not an unprimeable number, because it can be changed into a prime (725420321611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 341855830 + ... + 341857951.

It is an arithmetic number, because the mean of its divisors is an integer number (181526009121).

Almost surely, 2^725420321641 is an apocalyptic number.

It is an amenable number.

725420321641 is a deficient number, since it is larger than the sum of its proper divisors (683714843).

725420321641 is a wasteful number, since it uses less digits than its factorization.

725420321641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683714842.

The product of its (nonzero) digits is 80640, while the sum is 37.

The spelling of 725420321641 in words is "seven hundred twenty-five billion, four hundred twenty million, three hundred twenty-one thousand, six hundred forty-one".