70640161 has 4 divisors (see below), whose sum is σ = 70657092. Its totient is φ = 70623232.

The previous prime is 70640159. The next prime is 70640183. The reversal of 70640161 is 16104607.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 49617936 + 21022225 = 7044^2 + 4585^2 .

It is a cyclic number.

It is not a de Polignac number, because 70640161 - 2¹ = 70640159 is a prime.

It is a super-2 number, since 2×70640161² = 9980064692211842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70640111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2721 + ... + 12193.

It is an arithmetic number, because the mean of its divisors is an integer number (17664273).

Almost surely, 2^70640161 is an apocalyptic number.

It is an amenable number.

70640161 is a deficient number, since it is larger than the sum of its proper divisors (16931).

70640161 is an equidigital number, since it uses as much as digits as its factorization.

70640161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16930.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 70640161 is about 8404.7701336800. The cubic root of 70640161 is about 413.3810462755.

Adding to 70640161 its reverse (16104607), we get a palindrome (86744768).

The spelling of 70640161 in words is "seventy million, six hundred forty thousand, one hundred sixty-one".