15551552123551 has 4 divisors (see below), whose sum is σ = 15556818483472. Its totient is φ = 15546285763632.

The previous prime is 15551552123483. The next prime is 15551552123573. The reversal of 15551552123551 is 15532125515551.

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 15551552123551 - 2³¹ = 15549404639903 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 (15551552123951) 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, 2633175531 + ... + 2633181436.

It is an arithmetic number, because the mean of its divisors is an integer number (3889204620868).

Almost surely, 2^{15551552123551} is an apocalyptic number.

15551552123551 is a deficient number, since it is larger than the sum of its proper divisors (5266359921).

15551552123551 is an equidigital number, since it uses as much as digits as its factorization.

15551552123551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5266359920.

The product of its digits is 937500, while the sum is 46.

The spelling of 15551552123551 in words is "fifteen trillion, five hundred fifty-one billion, five hundred fifty-two million, one hundred twenty-three thousand, five hundred fifty-one".