70533633581 has 2 divisors, whose sum is σ = 70533633582. Its totient is φ = 70533633580.

The previous prime is 70533633493. The next prime is 70533633601. The reversal of 70533633581 is 18533633507.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41083641481 + 29449992100 = 202691^2 + 171610^2 .

It is a cyclic number.

It is not a de Polignac number, because 70533633581 - 2¹⁰ = 70533632557 is a prime.

It is a super-2 number, since 2×70533633581² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70533639581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35266816790 + 35266816791.

It is an arithmetic number, because the mean of its divisors is an integer number (35266816791).

Almost surely, 2^70533633581 is an apocalyptic number.

It is an amenable number.

70533633581 is a deficient number, since it is larger than the sum of its proper divisors (1).

70533633581 is an equidigital number, since it uses as much as digits as its factorization.

70533633581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 680400, while the sum is 44.

The spelling of 70533633581 in words is "seventy billion, five hundred thirty-three million, six hundred thirty-three thousand, five hundred eighty-one".