1490563705721 has 4 divisors (see below), whose sum is σ = 1491121762944. Its totient is φ = 1490005648500.

The previous prime is 1490563705691. The next prime is 1490563705723. The reversal of 1490563705721 is 1275073650941.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1490563705721 - 2³⁸ = 1215685798777 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1490563705721.

It is not an unprimeable number, because it can be changed into a prime (1490563705723) 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, 279024605 + ... + 279029946.

It is an arithmetic number, because the mean of its divisors is an integer number (372780440736).

Almost surely, 2^{1490563705721} is an apocalyptic number.

It is an amenable number.

1490563705721 is a deficient number, since it is larger than the sum of its proper divisors (558057223).

1490563705721 is an equidigital number, since it uses as much as digits as its factorization.

1490563705721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558057222.

The product of its (nonzero) digits is 1587600, while the sum is 50.

The spelling of 1490563705721 in words is "one trillion, four hundred ninety billion, five hundred sixty-three million, seven hundred five thousand, seven hundred twenty-one".