136545747021 has 6 divisors (see below), whose sum is σ = 197232745710. Its totient is φ = 91030498008.

The previous prime is 136545746933. The next prime is 136545747029. The reversal of 136545747021 is 120747545631.

136545747021 is a `hidden beast` number, since 1 + 3 + 6 + 5 + 4 + 574 + 70 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 128931264900 + 7614482121 = 359070^2 + 87261^2 .

It is not a de Polignac number, because 136545747021 - 2⁷ = 136545746893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136545747029) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7585874826 + ... + 7585874843.

It is an arithmetic number, because the mean of its divisors is an integer number (32872124285).

Almost surely, 2^136545747021 is an apocalyptic number.

It is an amenable number.

136545747021 is a deficient number, since it is larger than the sum of its proper divisors (60686998689).

136545747021 is a wasteful number, since it uses less digits than its factorization.

136545747021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15171749675 (or 15171749672 counting only the distinct ones).

The product of its (nonzero) digits is 705600, while the sum is 45.

It can be divided in two parts, 13654 and 5747021, that added together give a palindrome (5760675).

The spelling of 136545747021 in words is "one hundred thirty-six billion, five hundred forty-five million, seven hundred forty-seven thousand, twenty-one".