1551551232015 has 32 divisors (see below), whose sum is σ = 2758365173760. Its totient is φ = 827478428832.

The previous prime is 1551551231987. The next prime is 1551551232019. The reversal of 1551551232015 is 5102321551551.

1551551232015 is a `hidden beast` number, since 1 + 5 + 51 + 551 + 23 + 20 + 15 = 666.

It is not a de Polignac number, because 1551551232015 - 2¹⁴ = 1551551215631 is a prime.

It is a super-2 number, since 2×1551551232015² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1551551232019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12689502 + ... + 12811188.

It is an arithmetic number, because the mean of its divisors is an integer number (86198911680).

Almost surely, 2^{1551551232015} is an apocalyptic number.

1551551232015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1551551232015 is a deficient number, since it is larger than the sum of its proper divisors (1206813941745).

1551551232015 is a wasteful number, since it uses less digits than its factorization.

1551551232015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216148 (or 216142 counting only the distinct ones).

The product of its (nonzero) digits is 37500, while the sum is 36.

Adding to 1551551232015 its reverse (5102321551551), we get a palindrome (6653872783566).

The spelling of 1551551232015 in words is "one trillion, five hundred fifty-one billion, five hundred fifty-one million, two hundred thirty-two thousand, fifteen".