136385645721503 has 4 divisors (see below), whose sum is σ = 136888913787168. Its totient is φ = 135882377655840.

The previous prime is 136385645721491. The next prime is 136385645721527. The reversal of 136385645721503 is 305127546583631.

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 136385645721503 - 2⁴⁶ = 66016901543839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136385645727503) 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, 251634032426 + ... + 251634032967.

It is an arithmetic number, because the mean of its divisors is an integer number (34222228446792).

Almost surely, 2^{136385645721503} is an apocalyptic number.

136385645721503 is a deficient number, since it is larger than the sum of its proper divisors (503268065665).

136385645721503 is an equidigital number, since it uses as much as digits as its factorization.

136385645721503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503268065664.

The product of its (nonzero) digits is 54432000, while the sum is 59.

The spelling of 136385645721503 in words is "one hundred thirty-six trillion, three hundred eighty-five billion, six hundred forty-five million, seven hundred twenty-one thousand, five hundred three".