102111515055 has 128 divisors (see below), whose sum is σ = 201819340800. Its totient is φ = 48566044800.

The previous prime is 102111515003. The next prime is 102111515059. The reversal of 102111515055 is 550515111201.

It is a happy number.

102111515055 is a `hidden beast` number, since 1 + 0 + 2 + 1 + 1 + 151 + 505 + 5 = 666.

It is not a de Polignac number, because 102111515055 - 2⁶ = 102111514991 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102111515059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 55284142 + ... + 55285988.

It is an arithmetic number, because the mean of its divisors is an integer number (1576713600).

Almost surely, 2^102111515055 is an apocalyptic number.

102111515055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

102111515055 is a deficient number, since it is larger than the sum of its proper divisors (99707825745).

102111515055 is a wasteful number, since it uses less digits than its factorization.

102111515055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2562 (or 2556 counting only the distinct ones).

The product of its (nonzero) digits is 1250, while the sum is 27.

Adding to 102111515055 its reverse (550515111201), we get a palindrome (652626626256).

The spelling of 102111515055 in words is "one hundred two billion, one hundred eleven million, five hundred fifteen thousand, fifty-five".