70664321536 has 80 divisors (see below), whose sum is σ = 145209784104. Its totient is φ = 34329083904.

The previous prime is 70664321531. The next prime is 70664321537. The reversal of 70664321536 is 63512346607.

It can be written as a sum of positive squares in 4 ways, for example, as 59997563136 + 10666758400 = 244944^2 + 103280^2 .

It is a junction number, because it is equal to n+sod(n) for n = 70664321492 and 70664321501.

It is not an unprimeable number, because it can be changed into a prime (70664321531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16157046 + ... + 16161418.

Almost surely, 2^70664321536 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 70664321536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72604892052).

70664321536 is an abundant number, since it is smaller than the sum of its proper divisors (74545462568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

70664321536 is an equidigital number, since it uses as much as digits as its factorization.

70664321536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5281 (or 5265 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 43.

The spelling of 70664321536 in words is "seventy billion, six hundred sixty-four million, three hundred twenty-one thousand, five hundred thirty-six".