12124751661 has 24 divisors (see below), whose sum is σ = 19112936544. Its totient is φ = 7345539360.

The previous prime is 12124751659. The next prime is 12124751671. The reversal of 12124751661 is 16615742121.

12124751661 is a `hidden beast` number, since 1 + 21 + 2 + 475 + 166 + 1 = 666.

It is not a de Polignac number, because 12124751661 - 2¹ = 12124751659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12124751621) 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, 255010 + ... + 298796.

It is an arithmetic number, because the mean of its divisors is an integer number (796372356).

Almost surely, 2^12124751661 is an apocalyptic number.

12124751661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12124751661 is a deficient number, since it is larger than the sum of its proper divisors (6988184883).

12124751661 is a wasteful number, since it uses less digits than its factorization.

12124751661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46601 (or 46598 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The spelling of 12124751661 in words is "twelve billion, one hundred twenty-four million, seven hundred fifty-one thousand, six hundred sixty-one".