70505023921 has 2 divisors, whose sum is σ = 70505023922. Its totient is φ = 70505023920.

The previous prime is 70505023891. The next prime is 70505023937. The reversal of 70505023921 is 12932050507.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36016448400 + 34488575521 = 189780^2 + 185711^2 .

It is an emirp because it is prime and its reverse (12932050507) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 70505023921 - 2¹⁵ = 70504991153 is a prime.

It is not a weakly prime, because it can be changed into another prime (70505023961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35252511960 + 35252511961.

It is an arithmetic number, because the mean of its divisors is an integer number (35252511961).

Almost surely, 2^70505023921 is an apocalyptic number.

It is an amenable number.

70505023921 is a deficient number, since it is larger than the sum of its proper divisors (1).

70505023921 is an equidigital number, since it uses as much as digits as its factorization.

70505023921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18900, while the sum is 34.

The spelling of 70505023921 in words is "seventy billion, five hundred five million, twenty-three thousand, nine hundred twenty-one".