136553253721 has 4 divisors (see below), whose sum is σ = 138281776000. Its totient is φ = 134824731444.

The previous prime is 136553253689. The next prime is 136553253737. The reversal of 136553253721 is 127352355631.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 127352355631 = 29 ⋅4391460539.

It is a cyclic number.

It is not a de Polignac number, because 136553253721 - 2⁵ = 136553253689 is a prime.

It is a super-2 number, since 2×136553253721² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136553253121) 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, 864261021 + ... + 864261178.

It is an arithmetic number, because the mean of its divisors is an integer number (34570444000).

Almost surely, 2^136553253721 is an apocalyptic number.

It is an amenable number.

136553253721 is a deficient number, since it is larger than the sum of its proper divisors (1728522279).

136553253721 is an equidigital number, since it uses as much as digits as its factorization.

136553253721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1728522278.

The product of its digits is 567000, while the sum is 43.

The spelling of 136553253721 in words is "one hundred thirty-six billion, five hundred fifty-three million, two hundred fifty-three thousand, seven hundred twenty-one".