12651661354 has 4 divisors (see below), whose sum is σ = 18977492034. Its totient is φ = 6325830676.

The previous prime is 12651661349. The next prime is 12651661367. The reversal of 12651661354 is 45316615621.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45316615621 = 123989 ⋅365489.

It can be written as a sum of positive squares in only one way, i.e., 11888631225 + 763030129 = 109035^2 + 27623^2 .

It is a super-2 number, since 2×12651661354² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3162915337 + ... + 3162915340.

Almost surely, 2^12651661354 is an apocalyptic number.

12651661354 is a deficient number, since it is larger than the sum of its proper divisors (6325830680).

12651661354 is an equidigital number, since it uses as much as digits as its factorization.

12651661354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6325830679.

The product of its digits is 129600, while the sum is 40.

The spelling of 12651661354 in words is "twelve billion, six hundred fifty-one million, six hundred sixty-one thousand, three hundred fifty-four".