111651001605651 has 16 divisors (see below), whose sum is σ = 157636868515200. Its totient is φ = 70050230387328.

The previous prime is 111651001605629. The next prime is 111651001605701. The reversal of 111651001605651 is 156506100156111.

It is not a de Polignac number, because 111651001605651 - 2²⁷ = 111650867387923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (111651001605601) 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, 82132221 + ... + 83480558.

It is an arithmetic number, because the mean of its divisors is an integer number (9852304282200).

Almost surely, 2^{111651001605651} is an apocalyptic number.

111651001605651 is a deficient number, since it is larger than the sum of its proper divisors (45985866909549).

111651001605651 is a wasteful number, since it uses less digits than its factorization.

111651001605651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165626018.

The product of its (nonzero) digits is 27000, while the sum is 39.

The spelling of 111651001605651 in words is "one hundred eleven trillion, six hundred fifty-one billion, one million, six hundred five thousand, six hundred fifty-one".