70128533161 has 4 divisors (see below), whose sum is σ = 74253741012. Its totient is φ = 66003325312.

The previous prime is 70128533159. The next prime is 70128533177. The reversal of 70128533161 is 16133582107.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 64031265936 + 6097267225 = 253044^2 + 78085^2 .

It is a cyclic number.

It is not a de Polignac number, because 70128533161 - 2¹ = 70128533159 is a prime.

It is a super-2 number, since 2×70128533161² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 70128533161.

It is not an unprimeable number, because it can be changed into a prime (70128533141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2062603900 + ... + 2062603933.

It is an arithmetic number, because the mean of its divisors is an integer number (18563435253).

Almost surely, 2^70128533161 is an apocalyptic number.

It is an amenable number.

70128533161 is a deficient number, since it is larger than the sum of its proper divisors (4125207851).

70128533161 is a wasteful number, since it uses less digits than its factorization.

70128533161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4125207850.

The product of its (nonzero) digits is 30240, while the sum is 37.

The spelling of 70128533161 in words is "seventy billion, one hundred twenty-eight million, five hundred thirty-three thousand, one hundred sixty-one".