51949866069 has 24 divisors (see below), whose sum is σ = 75982413312. Its totient is φ = 34199755200.

The previous prime is 51949866047. The next prime is 51949866079. The reversal of 51949866069 is 96066894915.

51949866069 is a `hidden beast` number, since 5 + 19 + 4 + 9 + 8 + 6 + 606 + 9 = 666.

It is not a de Polignac number, because 51949866069 - 2⁵ = 51949866037 is a prime.

It is a super-2 number, since 2×51949866069² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51949865997 and 51949866015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51949866079) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 215244 + ... + 387594.

It is an arithmetic number, because the mean of its divisors is an integer number (3165933888).

Almost surely, 2^51949866069 is an apocalyptic number.

It is an amenable number.

51949866069 is a deficient number, since it is larger than the sum of its proper divisors (24032547243).

51949866069 is a wasteful number, since it uses less digits than its factorization.

51949866069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172777 (or 172774 counting only the distinct ones).

The product of its (nonzero) digits is 25194240, while the sum is 63.

The spelling of 51949866069 in words is "fifty-one billion, nine hundred forty-nine million, eight hundred sixty-six thousand, sixty-nine".