9865522929249 has 27 divisors (see below), whose sum is σ = 15430881309753. Its totient is φ = 6071015650752.

The previous prime is 9865522929221. The next prime is 9865522929277. The reversal of 9865522929249 is 9429292255689.

The square root of 9865522929249 is 3140943.

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

9865522929249 is a `hidden beast` number, since 9 + 8 + 6 + 5 + 522 + 9 + 2 + 92 + 4 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (9865522929221) and next prime (9865522929277).

It can be written as a sum of positive squares in 4 ways, for example, as 1846318416849 + 8019204512400 = 1358793^2 + 2831820^2 .

It is not a de Polignac number, because 9865522929249 - 2⁵ = 9865522929217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9865522929209) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 122456509 + ... + 122537045.

Almost surely, 2^{9865522929249} is an apocalyptic number.

9865522929249 is the 3140943-rd square number.

9865522929249 is the 1570472-nd centered octagonal number.

It is an amenable number.

9865522929249 is a deficient number, since it is larger than the sum of its proper divisors (5565358380504).

9865522929249 is an frugal number, since it uses more digits than its factorization.

9865522929249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161106 (or 80553 counting only the distinct ones).

The product of its digits is 503884800, while the sum is 72.

It can be divided in two parts, 986552 and 2929249, that added together give a triangular number (3915801 = T₂₇₉₈).

The spelling of 9865522929249 in words is "nine trillion, eight hundred sixty-five billion, five hundred twenty-two million, nine hundred twenty-nine thousand, two hundred forty-nine".