1205664537 has 16 divisors (see below), whose sum is σ = 2004221952. Its totient is φ = 626319120.

The previous prime is 1205664533. The next prime is 1205664547. The reversal of 1205664537 is 7354665021.

It is not a de Polignac number, because 1205664537 - 2² = 1205664533 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1205664495 and 1205664504.

It is not an unprimeable number, because it can be changed into a prime (1205664533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2609433 + ... + 2609894.

It is an arithmetic number, because the mean of its divisors is an integer number (125263872).

Almost surely, 2^1205664537 is an apocalyptic number.

It is an amenable number.

1205664537 is a deficient number, since it is larger than the sum of its proper divisors (798557415).

1205664537 is a wasteful number, since it uses less digits than its factorization.

1205664537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5219348.

The product of its (nonzero) digits is 151200, while the sum is 39.

The square root of 1205664537 is about 34722.6804408876. The cubic root of 1205664537 is about 1064.3280197425.

The spelling of 1205664537 in words is "one billion, two hundred five million, six hundred sixty-four thousand, five hundred thirty-seven".