111666061551 has 16 divisors (see below), whose sum is σ = 162458300160. Its totient is φ = 67661843520.

The previous prime is 111666061547. The next prime is 111666061643. The reversal of 111666061551 is 155160666111.

It is not a de Polignac number, because 111666061551 - 2² = 111666061547 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111666061511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 207190 + ... + 516003.

It is an arithmetic number, because the mean of its divisors is an integer number (10153643760).

Almost surely, 2^111666061551 is an apocalyptic number.

111666061551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

111666061551 is a deficient number, since it is larger than the sum of its proper divisors (50792238609).

111666061551 is a wasteful number, since it uses less digits than its factorization.

111666061551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 727886.

The product of its (nonzero) digits is 32400, while the sum is 39.

The spelling of 111666061551 in words is "one hundred eleven billion, six hundred sixty-six million, sixty-one thousand, five hundred fifty-one".