11749202699521 has 9 divisors (see below), whose sum is σ = 13667467786371. Its totient is φ = 10070724604752.

The previous prime is 11749202699513. The next prime is 11749202699543. The reversal of 11749202699521 is 12599620294711.

The square root of 11749202699521 is 3427711.

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., 58711713025 + 11690490986496 = 242305^2 + 3419136^2 .

It is not a de Polignac number, because 11749202699521 - 2³ = 11749202699513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11749202699501) 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, 23749141 + ... + 24238813.

It is an arithmetic number, because the mean of its divisors is an integer number (1518607531819).

Almost surely, 2^{11749202699521} is an apocalyptic number.

11749202699521 is the 3427711-st square number.

11749202699521 is the 1713856-th centered octagonal number.

It is an amenable number.

11749202699521 is a deficient number, since it is larger than the sum of its proper divisors (1918265086850).

11749202699521 is an frugal number, since it uses more digits than its factorization.

11749202699521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 979360 (or 489680 counting only the distinct ones).

The product of its (nonzero) digits is 4898880, while the sum is 58.

The spelling of 11749202699521 in words is "eleven trillion, seven hundred forty-nine billion, two hundred two million, six hundred ninety-nine thousand, five hundred twenty-one".