725846219521 has 2 divisors, whose sum is σ = 725846219522. Its totient is φ = 725846219520.

The previous prime is 725846219503. The next prime is 725846219551. The reversal of 725846219521 is 125912648527.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 656197203600 + 69649015921 = 810060^2 + 263911^2 .

It is a cyclic number.

It is not a de Polignac number, because 725846219521 - 2¹⁵ = 725846186753 is a prime.

It is not a weakly prime, because it can be changed into another prime (725846219551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 362923109760 + 362923109761.

It is an arithmetic number, because the mean of its divisors is an integer number (362923109761).

Almost surely, 2^725846219521 is an apocalyptic number.

It is an amenable number.

725846219521 is a deficient number, since it is larger than the sum of its proper divisors (1).

725846219521 is an equidigital number, since it uses as much as digits as its factorization.

725846219521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2419200, while the sum is 52.

The spelling of 725846219521 in words is "seven hundred twenty-five billion, eight hundred forty-six million, two hundred nineteen thousand, five hundred twenty-one".