51445214261 has 4 divisors (see below), whose sum is σ = 58794530592. Its totient is φ = 44095897932.

The previous prime is 51445214251. The next prime is 51445214341. The reversal of 51445214261 is 16241254415.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16241254415 = 5 ⋅3248250883.

It is a cyclic number.

It is not a de Polignac number, because 51445214261 - 2¹⁴ = 51445197877 is a prime.

It is a super-2 number, since 2×51445214261² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51445214221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3674658155 + ... + 3674658168.

It is an arithmetic number, because the mean of its divisors is an integer number (14698632648).

Almost surely, 2^51445214261 is an apocalyptic number.

It is an amenable number.

51445214261 is a deficient number, since it is larger than the sum of its proper divisors (7349316331).

51445214261 is an equidigital number, since it uses as much as digits as its factorization.

51445214261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7349316330.

The product of its digits is 38400, while the sum is 35.

Adding to 51445214261 its reverse (16241254415), we get a palindrome (67686468676).

The spelling of 51445214261 in words is "fifty-one billion, four hundred forty-five million, two hundred fourteen thousand, two hundred sixty-one".