69406831561 has 2 divisors, whose sum is σ = 69406831562. Its totient is φ = 69406831560.

The previous prime is 69406831517. The next prime is 69406831573. The reversal of 69406831561 is 16513860496.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52828724025 + 16578107536 = 229845^2 + 128756^2 .

It is a cyclic number.

It is not a de Polignac number, because 69406831561 - 2¹⁹ = 69406307273 is a prime.

It is not a weakly prime, because it can be changed into another prime (69406831961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34703415780 + 34703415781.

It is an arithmetic number, because the mean of its divisors is an integer number (34703415781).

Almost surely, 2^69406831561 is an apocalyptic number.

It is an amenable number.

69406831561 is a deficient number, since it is larger than the sum of its proper divisors (1).

69406831561 is an equidigital number, since it uses as much as digits as its factorization.

69406831561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 933120, while the sum is 49.

The spelling of 69406831561 in words is "sixty-nine billion, four hundred six million, eight hundred thirty-one thousand, five hundred sixty-one".