691695790539 has 16 divisors (see below), whose sum is σ = 993479008032. Its totient is φ = 425541178368.

The previous prime is 691695790493. The next prime is 691695790549. The reversal of 691695790539 is 935097596196.

It is not a de Polignac number, because 691695790539 - 2¹⁶ = 691695725003 is a prime.

It is not an unprimeable number, because it can be changed into a prime (691695790549) 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, 2310664 + ... + 2592789.

It is an arithmetic number, because the mean of its divisors is an integer number (62092438002).

Almost surely, 2^691695790539 is an apocalyptic number.

691695790539 is a deficient number, since it is larger than the sum of its proper divisors (301783217493).

691695790539 is a wasteful number, since it uses less digits than its factorization.

691695790539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4907086.

The product of its (nonzero) digits is 124002900, while the sum is 69.

The spelling of 691695790539 in words is "six hundred ninety-one billion, six hundred ninety-five million, seven hundred ninety thousand, five hundred thirty-nine".