1356660261 has 24 divisors (see below), whose sum is σ = 2167888320. Its totient is φ = 810633600.

The previous prime is 1356660257. The next prime is 1356660353. The reversal of 1356660261 is 1620666531.

It is not a de Polignac number, because 1356660261 - 2² = 1356660257 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1356661261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 89476 + ... + 103533.

It is an arithmetic number, because the mean of its divisors is an integer number (90328680).

Almost surely, 2^1356660261 is an apocalyptic number.

1356660261 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1356660261 is a deficient number, since it is larger than the sum of its proper divisors (811228059).

1356660261 is a wasteful number, since it uses less digits than its factorization.

1356660261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193097 (or 193094 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 1356660261 is about 36832.8693017527. The cubic root of 1356660261 is about 1107.0239955825.

The spelling of 1356660261 in words is "one billion, three hundred fifty-six million, six hundred sixty thousand, two hundred sixty-one".