101661111651 has 24 divisors (see below), whose sum is σ = 150419640384. Its totient is φ = 60568441840.

The previous prime is 101661111649. The next prime is 101661111667. The reversal of 101661111651 is 156111166101.

It is not a de Polignac number, because 101661111651 - 2¹ = 101661111649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (101661111611) 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 23 ways as a sum of consecutive naturals, for example, 327621 + ... + 557366.

It is an arithmetic number, because the mean of its divisors is an integer number (6267485016).

Almost surely, 2^101661111651 is an apocalyptic number.

101661111651 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

101661111651 is a deficient number, since it is larger than the sum of its proper divisors (48758528733).

101661111651 is an equidigital number, since it uses as much as digits as its factorization.

101661111651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 885119 (or 885060 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 30.

Adding to 101661111651 its reverse (156111166101), we get a palindrome (257772277752).

It can be divided in two parts, 101661 and 111651, that added together give a palindrome (213312).

The spelling of 101661111651 in words is "one hundred one billion, six hundred sixty-one million, one hundred eleven thousand, six hundred fifty-one".