136421660679 has 4 divisors (see below), whose sum is σ = 181895547576. Its totient is φ = 90947773784.

The previous prime is 136421660677. The next prime is 136421660689. The reversal of 136421660679 is 976066124631.

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

It is a cyclic number.

It is not a de Polignac number, because 136421660679 - 2¹ = 136421660677 is a prime.

It is a super-2 number, since 2×136421660679² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136421660671) 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, 22736943444 + ... + 22736943449.

It is an arithmetic number, because the mean of its divisors is an integer number (45473886894).

Almost surely, 2^136421660679 is an apocalyptic number.

136421660679 is a deficient number, since it is larger than the sum of its proper divisors (45473886897).

136421660679 is an equidigital number, since it uses as much as digits as its factorization.

136421660679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45473886896.

The product of its (nonzero) digits is 1959552, while the sum is 51.

The spelling of 136421660679 in words is "one hundred thirty-six billion, four hundred twenty-one million, six hundred sixty thousand, six hundred seventy-nine".