1493765506809 has 27 divisors (see below), whose sum is σ = 2255678748687. Its totient is φ = 952492343616.

The previous prime is 1493765506771. The next prime is 1493765506829. The reversal of 1493765506809 is 9086055673941.

The square root of 1493765506809 is 1222197.

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

1493765506809 is a `hidden beast` number, since 1 + 4 + 9 + 3 + 76 + 550 + 6 + 8 + 0 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1397868759225 + 95896747584 = 1182315^2 + 309672^2 .

It is not a de Polignac number, because 1493765506809 - 2⁹ = 1493765506297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1493765506829) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 84322737 + ... + 84340449.

Almost surely, 2^{1493765506809} is an apocalyptic number.

1493765506809 is the 1222197-th square number.

1493765506809 is the 611099-th centered octagonal number.

It is an amenable number.

1493765506809 is a deficient number, since it is larger than the sum of its proper divisors (761913241878).

1493765506809 is an frugal number, since it uses more digits than its factorization.

1493765506809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35478 (or 17739 counting only the distinct ones).

The product of its (nonzero) digits is 48988800, while the sum is 63.

The spelling of 1493765506809 in words is "one trillion, four hundred ninety-three billion, seven hundred sixty-five million, five hundred six thousand, eight hundred nine".