26069654521 has 3 divisors (see below), whose sum is σ = 26069815983. Its totient is φ = 26069493060.

The previous prime is 26069654519. The next prime is 26069654531. The reversal of 26069654521 is 12545696062.

The square root of 26069654521 is 161461.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 5865874921 + 20203779600 = 76589^2 + 142140^2 .

It is not a de Polignac number, because 26069654521 - 2¹ = 26069654519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26069654531) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 80731 + ... + 242191.

It is an arithmetic number, because the mean of its divisors is an integer number (8689938661).

Almost surely, 2^26069654521 is an apocalyptic number.

26069654521 is the 161461-st square number.

26069654521 is the 80731-st centered octagonal number.

It is an amenable number.

26069654521 is a deficient number, since it is larger than the sum of its proper divisors (161462).

26069654521 is an frugal number, since it uses more digits than its factorization.

26069654521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322922 (or 161461 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 46.

The spelling of 26069654521 in words is "twenty-six billion, sixty-nine million, six hundred fifty-four thousand, five hundred twenty-one".