694438125553 has 2 divisors, whose sum is σ = 694438125554. Its totient is φ = 694438125552.

The previous prime is 694438125547. The next prime is 694438125673. The reversal of 694438125553 is 355521834496.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 599707750464 + 94730375089 = 774408^2 + 307783^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-694438125553 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 694438125494 and 694438125503.

It is not a weakly prime, because it can be changed into another prime (694438135553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 347219062776 + 347219062777.

It is an arithmetic number, because the mean of its divisors is an integer number (347219062777).

Almost surely, 2^694438125553 is an apocalyptic number.

It is an amenable number.

694438125553 is a deficient number, since it is larger than the sum of its proper divisors (1).

694438125553 is an equidigital number, since it uses as much as digits as its factorization.

694438125553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552000, while the sum is 55.

The spelling of 694438125553 in words is "six hundred ninety-four billion, four hundred thirty-eight million, one hundred twenty-five thousand, five hundred fifty-three".