69673805431921 has 4 divisors (see below), whose sum is σ = 70141414864500. Its totient is φ = 69206195999344.

The previous prime is 69673805431913. The next prime is 69673805431933. The reversal of 69673805431921 is 12913450837696.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21314020457521 + 48359784974400 = 4616711^2 + 6954120^2 .

It is a cyclic number.

It is not a de Polignac number, because 69673805431921 - 2³ = 69673805431913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (69673805434921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 233804716066 + ... + 233804716363.

It is an arithmetic number, because the mean of its divisors is an integer number (17535353716125).

It is a 1-persistent number, because it is pandigital, but 2⋅69673805431921 = 139347610863842 is not.

Almost surely, 2^{69673805431921} is an apocalyptic number.

It is an amenable number.

69673805431921 is a deficient number, since it is larger than the sum of its proper divisors (467609432579).

69673805431921 is a wasteful number, since it uses less digits than its factorization.

69673805431921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467609432578.

The product of its (nonzero) digits is 58786560, while the sum is 64.

The spelling of 69673805431921 in words is "sixty-nine trillion, six hundred seventy-three billion, eight hundred five million, four hundred thirty-one thousand, nine hundred twenty-one".