1551165550011 has 24 divisors (see below), whose sum is σ = 2793440991744. Its totient is φ = 805800285360.

The previous prime is 1551165549971. The next prime is 1551165550013. The reversal of 1551165550011 is 1100555611551.

1551165550011 is a `hidden beast` number, since 1 + 551 + 1 + 6 + 55 + 50 + 0 + 1 + 1 = 666.

It is not a de Polignac number, because 1551165550011 - 2¹⁵ = 1551165517243 is a prime.

It is a super-3 number, since 3×1551165550011³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (1551165550013) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1119166371 + ... + 1119167756.

It is an arithmetic number, because the mean of its divisors is an integer number (116393374656).

Almost surely, 2^{1551165550011} is an apocalyptic number.

1551165550011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1551165550011 is a deficient number, since it is larger than the sum of its proper divisors (1242275441733).

1551165550011 is a wasteful number, since it uses less digits than its factorization.

1551165550011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2238334151 (or 2238334148 counting only the distinct ones).

The product of its (nonzero) digits is 18750, while the sum is 36.

The spelling of 1551165550011 in words is "one trillion, five hundred fifty-one billion, one hundred sixty-five million, five hundred fifty thousand, eleven".