5451661321251 has 16 divisors (see below), whose sum is σ = 7549394734080. Its totient is φ = 3495622923360.

The previous prime is 5451661321247. The next prime is 5451661321261. The reversal of 5451661321251 is 1521231661545.

5451661321251 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 5451661321251 - 2² = 5451661321247 is a prime.

It is a super-2 number, since 2×5451661321251² (a number of 26 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (5451661321261) 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, 179800836 + ... + 179831153.

It is an arithmetic number, because the mean of its divisors is an integer number (471837170880).

Almost surely, 2^{5451661321251} is an apocalyptic number.

5451661321251 is a deficient number, since it is larger than the sum of its proper divisors (2097733412829).

5451661321251 is a wasteful number, since it uses less digits than its factorization.

5451661321251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359632186.

The product of its digits is 216000, while the sum is 42.

Adding to 5451661321251 its reverse (1521231661545), we get a palindrome (6972892982796).

The spelling of 5451661321251 in words is "five trillion, four hundred fifty-one billion, six hundred sixty-one million, three hundred twenty-one thousand, two hundred fifty-one".