69943851961 has 27 divisors (see below), whose sum is σ = 76144749807. Its totient is φ = 64234230720.

The previous prime is 69943851947. The next prime is 69943851977. The reversal of 69943851961 is 16915834996.

The square root of 69943851961 is 264469.

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., 54454556025 + 15489295936 = 233355^2 + 124456^2 .

It is not a de Polignac number, because 69943851961 - 2⁷ = 69943851833 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 69943851961.

It is not an unprimeable number, because it can be changed into a prime (69943851911) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 211310566 + ... + 211310896.

Almost surely, 2^69943851961 is an apocalyptic number.

69943851961 is the 264469-th square number.

69943851961 is the 132235-th centered octagonal number.

It is an amenable number.

69943851961 is a deficient number, since it is larger than the sum of its proper divisors (6200897846).

69943851961 is an frugal number, since it uses more digits than its factorization.

69943851961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790 (or 395 counting only the distinct ones).

The product of its digits is 12597120, while the sum is 61.

The spelling of 69943851961 in words is "sixty-nine billion, nine hundred forty-three million, eight hundred fifty-one thousand, nine hundred sixty-one".