1366147261 has 16 divisors (see below), whose sum is σ = 1459238400. Its totient is φ = 1278411024.

The previous prime is 1366147259. The next prime is 1366147273. The reversal of 1366147261 is 1627416631.

It is not a de Polignac number, because 1366147261 - 2¹ = 1366147259 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1366147261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1366147231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 570655 + ... + 573043.

It is an arithmetic number, because the mean of its divisors is an integer number (91202400).

Almost surely, 2^1366147261 is an apocalyptic number.

It is an amenable number.

1366147261 is a deficient number, since it is larger than the sum of its proper divisors (93091139).

1366147261 is an frugal number, since it uses more digits than its factorization.

1366147261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2505 (or 2459 counting only the distinct ones).

The product of its digits is 36288, while the sum is 37.

The square root of 1366147261 is about 36961.4293690057. The cubic root of 1366147261 is about 1109.5984427964.

The spelling of 1366147261 in words is "one billion, three hundred sixty-six million, one hundred forty-seven thousand, two hundred sixty-one".