7886049020521 has 9 divisors (see below), whose sum is σ = 9173590094871. Its totient is φ = 6759453739752.

The previous prime is 7886049020513. The next prime is 7886049020537. The reversal of 7886049020521 is 1250209406887.

The square root of 7886049020521 is 2808211.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 7848038059225 + 38010961296 = 2801435^2 + 194964^2 .

It is not a de Polignac number, because 7886049020521 - 2³ = 7886049020513 is a prime.

It is a super-2 number, since 2×7886049020521² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7886049020561) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 19456891 + ... + 19858063.

It is an arithmetic number, because the mean of its divisors is an integer number (1019287788319).

Almost surely, 2^{7886049020521} is an apocalyptic number.

7886049020521 is the 2808211-st square number.

7886049020521 is the 1404106-th centered octagonal number.

It is an amenable number.

7886049020521 is a deficient number, since it is larger than the sum of its proper divisors (1287541074350).

7886049020521 is an frugal number, since it uses more digits than its factorization.

7886049020521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 802360 (or 401180 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 52.

The spelling of 7886049020521 in words is "seven trillion, eight hundred eighty-six billion, forty-nine million, twenty thousand, five hundred twenty-one".