691290458065 has 8 divisors (see below), whose sum is σ = 834637805568. Its totient is φ = 549639529200.

The previous prime is 691290458063. The next prime is 691290458069. The reversal of 691290458065 is 560854092196.

691290458065 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 691290458065 - 2¹ = 691290458063 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 691290457997 and 691290458015.

It is not an unprimeable number, because it can be changed into a prime (691290458063) 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, 424103761 + ... + 424105390.

It is an arithmetic number, because the mean of its divisors is an integer number (104329725696).

Almost surely, 2^691290458065 is an apocalyptic number.

It is an amenable number.

691290458065 is a deficient number, since it is larger than the sum of its proper divisors (143347347503).

691290458065 is a wasteful number, since it uses less digits than its factorization.

691290458065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 848209319.

The product of its (nonzero) digits is 4665600, while the sum is 55.

The spelling of 691290458065 in words is "six hundred ninety-one billion, two hundred ninety million, four hundred fifty-eight thousand, sixty-five".