1336786561 has 4 divisors (see below), whose sum is σ = 1458312624. Its totient is φ = 1215260500.

The previous prime is 1336786559. The next prime is 1336786589. The reversal of 1336786561 is 1656876331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1336786561 - 2¹ = 1336786559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1336786501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60763015 + ... + 60763036.

It is an arithmetic number, because the mean of its divisors is an integer number (364578156).

Almost surely, 2^1336786561 is an apocalyptic number.

1336786561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1336786561 is a deficient number, since it is larger than the sum of its proper divisors (121526063).

1336786561 is a wasteful number, since it uses less digits than its factorization.

1336786561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121526062.

The product of its digits is 544320, while the sum is 46.

The square root of 1336786561 is about 36562.0918575510. The cubic root of 1336786561 is about 1101.5917893797.

The spelling of 1336786561 in words is "one billion, three hundred thirty-six million, seven hundred eighty-six thousand, five hundred sixty-one".