70897797726889 has 81 divisors (see below), whose sum is σ = 88334990025327. Its totient is φ = 56725223482368.

The previous prime is 70897797726887. The next prime is 70897797726979. The reversal of 70897797726889 is 98862779779807.

The square root of 70897797726889 is 8420083.

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

It can be written as a sum of positive squares in 13 ways, for example, as 14988380619289 + 55909417107600 = 3871483^2 + 7477260^2 .

It is not a de Polignac number, because 70897797726889 - 2¹ = 70897797726887 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 70897797726797 and 70897797726806.

It is not an unprimeable number, because it can be changed into a prime (70897797726887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 173344248517 + ... + 173344248925.

Almost surely, 2^{70897797726889} is an apocalyptic number.

70897797726889 is the 8420083-rd square number.

70897797726889 is the 4210042-nd centered octagonal number.

It is an amenable number.

70897797726889 is a deficient number, since it is larger than the sum of its proper divisors (17437192298438).

70897797726889 is an frugal number, since it uses more digits than its factorization.

70897797726889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1212 (or 606 counting only the distinct ones).

The product of its (nonzero) digits is 75278149632, while the sum is 94.

The spelling of 70897797726889 in words is "seventy trillion, eight hundred ninety-seven billion, seven hundred ninety-seven million, seven hundred twenty-six thousand, eight hundred eighty-nine".