136354406621 has 8 divisors (see below), whose sum is σ = 140372312664. Its totient is φ = 132354008640.

The previous prime is 136354406569. The next prime is 136354406641. The reversal of 136354406621 is 126604453631.

It can be written as a sum of positive squares in 4 ways, for example, as 12485604121 + 123868802500 = 111739^2 + 351950^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-136354406621 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 (136354406641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4361210 + ... + 4392363.

It is an arithmetic number, because the mean of its divisors is an integer number (17546539083).

Almost surely, 2^136354406621 is an apocalyptic number.

It is an amenable number.

136354406621 is a deficient number, since it is larger than the sum of its proper divisors (4017906043).

136354406621 is an equidigital number, since it uses as much as digits as its factorization.

136354406621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8754031.

The product of its (nonzero) digits is 311040, while the sum is 41.

The spelling of 136354406621 in words is "one hundred thirty-six billion, three hundred fifty-four million, four hundred six thousand, six hundred twenty-one".