15553122135551 has 64 divisors (see below), whose sum is σ = 20965881431040. Its totient is φ = 11142430709760.

The previous prime is 15553122135521. The next prime is 15553122135553.

15553122135551 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 15553122135551 - 2⁶ = 15553122135487 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15553122135553) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 850399415 + ... + 850417703.

It is an arithmetic number, because the mean of its divisors is an integer number (327591897360).

Almost surely, 2^{15553122135551} is an apocalyptic number.

15553122135551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

15553122135551 is a deficient number, since it is larger than the sum of its proper divisors (5412759295489).

15553122135551 is a wasteful number, since it uses less digits than its factorization.

15553122135551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21664.

The product of its digits is 562500, while the sum is 44.

The spelling of 15553122135551 in words is "fifteen trillion, five hundred fifty-three billion, one hundred twenty-two million, one hundred thirty-five thousand, five hundred fifty-one".