69385354921 has 3 divisors (see below), whose sum is σ = 69385618333. Its totient is φ = 69385091510.

The previous prime is 69385354897. The next prime is 69385355047. The reversal of 69385354921 is 12945358396.

The square root of 69385354921 is 263411.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 69385354921 - 2⁷ = 69385354793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (69385351921) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 131706 + ... + 395116.

Almost surely, 2^69385354921 is an apocalyptic number.

69385354921 is the 263411-st square number.

69385354921 is the 131706-th centered octagonal number.

It is an amenable number.

69385354921 is a deficient number, since it is larger than the sum of its proper divisors (263412).

69385354921 is an frugal number, since it uses more digits than its factorization.

69385354921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526822 (or 263411 counting only the distinct ones).

The product of its digits is 6998400, while the sum is 55.

The spelling of 69385354921 in words is "sixty-nine billion, three hundred eighty-five million, three hundred fifty-four thousand, nine hundred twenty-one".