12161151207491 has 16 divisors (see below), whose sum is σ = 14295787225440. Its totient is φ = 10199047115520.

The previous prime is 12161151207481. The next prime is 12161151207509. The reversal of 12161151207491 is 19470215116121.

It is a cyclic number.

It is not a de Polignac number, because 12161151207491 - 2¹⁸ = 12161150945347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12161151207451) 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, 25238570 + ... + 25715903.

It is an arithmetic number, because the mean of its divisors is an integer number (893486701590).

Almost surely, 2^{12161151207491} is an apocalyptic number.

12161151207491 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12161151207491 is a deficient number, since it is larger than the sum of its proper divisors (2134636017949).

12161151207491 is a wasteful number, since it uses less digits than its factorization.

12161151207491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50956166.

The product of its (nonzero) digits is 30240, while the sum is 41.

The spelling of 12161151207491 in words is "twelve trillion, one hundred sixty-one billion, one hundred fifty-one million, two hundred seven thousand, four hundred ninety-one".