15551555123 has 4 divisors (see below), whose sum is σ = 16747828608. Its totient is φ = 14355281640.

The previous prime is 15551555113. The next prime is 15551555177. The reversal of 15551555123 is 32155515551.

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 15551555123 - 2¹⁶ = 15551489587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15551555113) 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, 598136723 + ... + 598136748.

It is an arithmetic number, because the mean of its divisors is an integer number (4186957152).

Almost surely, 2^15551555123 is an apocalyptic number.

15551555123 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

15551555123 is a deficient number, since it is larger than the sum of its proper divisors (1196273485).

15551555123 is a wasteful number, since it uses less digits than its factorization.

15551555123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1196273484.

The product of its digits is 93750, while the sum is 38.

The spelling of 15551555123 in words is "fifteen billion, five hundred fifty-one million, five hundred fifty-five thousand, one hundred twenty-three".