69446479729 has 9 divisors (see below), whose sum is σ = 76336920331. Its totient is φ = 63130528120.

The previous prime is 69446479723. The next prime is 69446479787. The reversal of 69446479729 is 92797464496.

The square root of 69446479729 is 263527.

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

It can be written as a sum of positive squares in only one way, i.e., 56689229025 + 12757250704 = 238095^2 + 112948^2 .

It is not a de Polignac number, because 69446479729 - 2¹⁵ = 69446446961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (69446479723) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2886819 + ... + 2910775.

Almost surely, 2^69446479729 is an apocalyptic number.

69446479729 is the 263527-th square number.

69446479729 is the 131764-th centered octagonal number.

It is an amenable number.

69446479729 is a deficient number, since it is larger than the sum of its proper divisors (6890440602).

69446479729 is an frugal number, since it uses more digits than its factorization.

69446479729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47936 (or 23968 counting only the distinct ones).

The product of its digits is 164602368, while the sum is 67.

The spelling of 69446479729 in words is "sixty-nine billion, four hundred forty-six million, four hundred seventy-nine thousand, seven hundred twenty-nine".