691795497901 has 8 divisors (see below), whose sum is σ = 716411064600. Its totient is φ = 667230634560.

The previous prime is 691795497871. The next prime is 691795497919. The reversal of 691795497901 is 109794597196.

It can be written as a sum of positive squares in 4 ways, for example, as 7477752676 + 684317745225 = 86474^2 + 827235^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-691795497901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691795497971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12648066 + ... + 12702643.

It is an arithmetic number, because the mean of its divisors is an integer number (89551383075).

Almost surely, 2^691795497901 is an apocalyptic number.

It is an amenable number.

691795497901 is a deficient number, since it is larger than the sum of its proper divisors (24615566699).

691795497901 is a wasteful number, since it uses less digits than its factorization.

691795497901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25351679.

The product of its (nonzero) digits is 38578680, while the sum is 67.

The spelling of 691795497901 in words is "six hundred ninety-one billion, seven hundred ninety-five million, four hundred ninety-seven thousand, nine hundred one".