724756001621 has 2 divisors, whose sum is σ = 724756001622. Its totient is φ = 724756001620.

The previous prime is 724756001603. The next prime is 724756001657. The reversal of 724756001621 is 126100657427.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 721913619025 + 2842382596 = 849655^2 + 53314^2 .

It is a cyclic number.

It is not a de Polignac number, because 724756001621 - 2²² = 724751807317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (724756006621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 362378000810 + 362378000811.

It is an arithmetic number, because the mean of its divisors is an integer number (362378000811).

Almost surely, 2^724756001621 is an apocalyptic number.

It is an amenable number.

724756001621 is a deficient number, since it is larger than the sum of its proper divisors (1).

724756001621 is an equidigital number, since it uses as much as digits as its factorization.

724756001621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 141120, while the sum is 41.

The spelling of 724756001621 in words is "seven hundred twenty-four billion, seven hundred fifty-six million, one thousand, six hundred twenty-one".