51763366621 has 4 divisors (see below), whose sum is σ = 51765190492. Its totient is φ = 51761542752.

The previous prime is 51763366609. The next prime is 51763366637. The reversal of 51763366621 is 12666336715.

51763366621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12666336715 = 5 ⋅2533267343.

It can be written as a sum of positive squares in 2 ways, for example, as 30910562596 + 20852804025 = 175814^2 + 144405^2 .

It is a cyclic number.

It is not a de Polignac number, because 51763366621 - 2⁷ = 51763366493 is a prime.

It is a super-2 number, since 2×51763366621² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51763366121) 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, 868680 + ... + 926353.

It is an arithmetic number, because the mean of its divisors is an integer number (12941297623).

Almost surely, 2^51763366621 is an apocalyptic number.

It is an amenable number.

51763366621 is a deficient number, since it is larger than the sum of its proper divisors (1823871).

51763366621 is a wasteful number, since it uses less digits than its factorization.

51763366621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1823870.

The product of its digits is 816480, while the sum is 46.

The spelling of 51763366621 in words is "fifty-one billion, seven hundred sixty-three million, three hundred sixty-six thousand, six hundred twenty-one".