457756019821 has 2 divisors, whose sum is σ = 457756019822. Its totient is φ = 457756019820.

The previous prime is 457756019807. The next prime is 457756019879. The reversal of 457756019821 is 128910657754.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 342980066025 + 114775953796 = 585645^2 + 338786^2 .

It is a cyclic number.

It is not a de Polignac number, because 457756019821 - 2¹¹ = 457756017773 is a prime.

It is a super-3 number, since 3×457756019821³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (457756019891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 228878009910 + 228878009911.

It is an arithmetic number, because the mean of its divisors is an integer number (228878009911).

Almost surely, 2^457756019821 is an apocalyptic number.

It is an amenable number.

457756019821 is a deficient number, since it is larger than the sum of its proper divisors (1).

457756019821 is an equidigital number, since it uses as much as digits as its factorization.

457756019821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4233600, while the sum is 55.

The spelling of 457756019821 in words is "four hundred fifty-seven billion, seven hundred fifty-six million, nineteen thousand, eight hundred twenty-one".