26787541561 has 9 divisors (see below), whose sum is σ = 29446136293. Its totient is φ = 24350673820.

The previous prime is 26787541553. The next prime is 26787541577. The reversal of 26787541561 is 16514578762.

The square root of 26787541561 is 163669.

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

It is not a de Polignac number, because 26787541561 - 2³ = 26787541553 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 26787541499 and 26787541508.

It is not an unprimeable number, because it can be changed into a prime (26787541531) 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, 1792920 + ... + 1807798.

Almost surely, 2^26787541561 is an apocalyptic number.

26787541561 is the 163669-th square number.

26787541561 is the 81835-th centered octagonal number.

It is an amenable number.

26787541561 is a deficient number, since it is larger than the sum of its proper divisors (2658594732).

26787541561 is an frugal number, since it uses more digits than its factorization.

26787541561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29780 (or 14890 counting only the distinct ones).

The product of its digits is 2822400, while the sum is 52.

The spelling of 26787541561 in words is "twenty-six billion, seven hundred eighty-seven million, five hundred forty-one thousand, five hundred sixty-one".