689696593450 has 24 divisors (see below), whose sum is σ = 1358296586892. Its totient is φ = 259650481920.

The previous prime is 689696593351. The next prime is 689696593463. The reversal of 689696593450 is 54395696986.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 214560724849 + 475135868601 = 463207^2 + 689301^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 689696593450.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 405703029 + ... + 405704728.

Almost surely, 2^689696593450 is an apocalyptic number.

689696593450 is a deficient number, since it is larger than the sum of its proper divisors (668599993442).

689696593450 is a wasteful number, since it uses less digits than its factorization.

689696593450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811407786 (or 811407781 counting only the distinct ones).

The product of its (nonzero) digits is 377913600, while the sum is 70.

The spelling of 689696593450 in words is "six hundred eighty-nine billion, six hundred ninety-six million, five hundred ninety-three thousand, four hundred fifty".