51161232021544 has 16 divisors (see below), whose sum is σ = 99235148318100. Its totient is φ = 24698525803392.

The previous prime is 51161232021539. The next prime is 51161232021593. The reversal of 51161232021544 is 44512023216115.

51161232021544 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 45599794628644 + 5561437392900 = 6752762^2 + 2358270^2 .

It is a super-4 number, since 4×51161232021544⁴ (a number of 56 digits) contains 4444 as substring.

It is an unprimeable number.

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, 110261275677 + ... + 110261276140.

Almost surely, 2^{51161232021544} is an apocalyptic number.

It is an amenable number.

51161232021544 is a deficient number, since it is larger than the sum of its proper divisors (48073916296556).

51161232021544 is a wasteful number, since it uses less digits than its factorization.

51161232021544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220522551852 (or 220522551848 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 37.

Adding to 51161232021544 its reverse (44512023216115), we get a palindrome (95673255237659).

The spelling of 51161232021544 in words is "fifty-one trillion, one hundred sixty-one billion, two hundred thirty-two million, twenty-one thousand, five hundred forty-four".