135553651654521 has 32 divisors (see below), whose sum is σ = 192033463248000. Its totient is φ = 84810912012288.

The previous prime is 135553651654517. The next prime is 135553651654627. The reversal of 135553651654521 is 125456156355531.

It is a happy number.

It is not a de Polignac number, because 135553651654521 - 2² = 135553651654517 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (135553651654921) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29898595 + ... + 34132583.

It is an arithmetic number, because the mean of its divisors is an integer number (6001045726500).

Almost surely, 2^{135553651654521} is an apocalyptic number.

It is an amenable number.

135553651654521 is a deficient number, since it is larger than the sum of its proper divisors (56479811593479).

135553651654521 is a wasteful number, since it uses less digits than its factorization.

135553651654521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4239273.

The product of its digits is 40500000, while the sum is 57.

The spelling of 135553651654521 in words is "one hundred thirty-five trillion, five hundred fifty-three billion, six hundred fifty-one million, six hundred fifty-four thousand, five hundred twenty-one".