69641478451609 has 9 divisors (see below), whose sum is σ = 73979160685311. Its totient is φ = 65544787373280.

The previous prime is 69641478451591. The next prime is 69641478451661. The reversal of 69641478451609 is 90615487414696.

The square root of 69641478451609 is 8345147.

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., 54219144123225 + 15422334328384 = 7363365^2 + 3927128^2 .

It is not a de Polignac number, because 69641478451609 - 2³⁵ = 69607118713241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (69641478451669) 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, 141622054 + ... + 142112944.

Almost surely, 2^{69641478451609} is an apocalyptic number.

69641478451609 is the 8345147-th square number.

69641478451609 is the 4172574-th centered octagonal number.

It is an amenable number.

69641478451609 is a deficient number, since it is larger than the sum of its proper divisors (4337682233702).

69641478451609 is an frugal number, since it uses more digits than its factorization.

69641478451609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 981816 (or 490908 counting only the distinct ones).

The product of its (nonzero) digits is 313528320, while the sum is 70.

The spelling of 69641478451609 in words is "sixty-nine trillion, six hundred forty-one billion, four hundred seventy-eight million, four hundred fifty-one thousand, six hundred nine".