70512312859921 has 27 divisors (see below), whose sum is σ = 73451262300283. Its totient is φ = 67689850707440.

The previous prime is 70512312859907. The next prime is 70512312859951. The reversal of 70512312859921 is 12995821321507.

The square root of 70512312859921 is 8397161.

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., 50832123012225 + 19680189847696 = 7129665^2 + 4436236^2 .

It is not a de Polignac number, because 70512312859921 - 2¹⁵ = 70512312827153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70512312859951) 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 26 ways as a sum of consecutive naturals, for example, 20917326366 + ... + 20917329736.

Almost surely, 2^{70512312859921} is an apocalyptic number.

70512312859921 is the 8397161-st square number.

70512312859921 is the 4198581-st centered octagonal number.

It is an amenable number.

70512312859921 is a deficient number, since it is larger than the sum of its proper divisors (2938949440362).

70512312859921 is an frugal number, since it uses more digits than its factorization.

70512312859921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6942 (or 3471 counting only the distinct ones).

The product of its (nonzero) digits is 2721600, while the sum is 55.

The spelling of 70512312859921 in words is "seventy trillion, five hundred twelve billion, three hundred twelve million, eight hundred fifty-nine thousand, nine hundred twenty-one".