1551108966449 has 4 divisors (see below), whose sum is σ = 1772695961664. Its totient is φ = 1329521971236.

The previous prime is 1551108966403. The next prime is 1551108966457. The reversal of 1551108966449 is 9446698011551.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1551108966449 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1551108966469) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110793497597 + ... + 110793497610.

It is an arithmetic number, because the mean of its divisors is an integer number (443173990416).

Almost surely, 2^{1551108966449} is an apocalyptic number.

It is an amenable number.

1551108966449 is a deficient number, since it is larger than the sum of its proper divisors (221586995215).

1551108966449 is an equidigital number, since it uses as much as digits as its factorization.

1551108966449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221586995214.

The product of its (nonzero) digits is 9331200, while the sum is 59.

The spelling of 1551108966449 in words is "one trillion, five hundred fifty-one billion, one hundred eight million, nine hundred sixty-six thousand, four hundred forty-nine".