1356605661 has 16 divisors (see below), whose sum is σ = 1918214784. Its totient is φ = 849867264.

The previous prime is 1356605659. The next prime is 1356605689. The reversal of 1356605661 is 1665066531.

It is not a de Polignac number, because 1356605661 - 2¹ = 1356605659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1356605611) 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, 12441 + ... + 53553.

It is an arithmetic number, because the mean of its divisors is an integer number (119888424).

Almost surely, 2^1356605661 is an apocalyptic number.

It is an amenable number.

1356605661 is a deficient number, since it is larger than the sum of its proper divisors (561609123).

1356605661 is a wasteful number, since it uses less digits than its factorization.

1356605661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41780.

The product of its (nonzero) digits is 97200, while the sum is 39.

The square root of 1356605661 is about 36832.1281084870. The cubic root of 1356605661 is about 1107.0091443279.

The spelling of 1356605661 in words is "one billion, three hundred fifty-six million, six hundred five thousand, six hundred sixty-one".