69638987665 has 8 divisors (see below), whose sum is σ = 89994999528. Its totient is φ = 51425713920.

The previous prime is 69638987657. The next prime is 69638987669. The reversal of 69638987665 is 56678983696.

It is a Cunningham number, because it is equal to 263892²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 10301438016 + 59337549649 = 101496^2 + 243593^2 .

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

It is not a de Polignac number, because 69638987665 - 2³ = 69638987657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (69638987669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 535684456 + ... + 535684585.

It is an arithmetic number, because the mean of its divisors is an integer number (11249374941).

Almost surely, 2^69638987665 is an apocalyptic number.

69638987665 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

69638987665 is a deficient number, since it is larger than the sum of its proper divisors (20356011863).

69638987665 is a wasteful number, since it uses less digits than its factorization.

69638987665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1071369059.

The product of its digits is 705438720, while the sum is 73.

The spelling of 69638987665 in words is "sixty-nine billion, six hundred thirty-eight million, nine hundred eighty-seven thousand, six hundred sixty-five".