51200695890 has 32 divisors (see below), whose sum is σ = 136535189760. Its totient is φ = 13653518832.

The previous prime is 51200695849. The next prime is 51200695891. The reversal of 51200695890 is 9859600215.

51200695890 is a `hidden beast` number, since 5 + 1 + 2 + 0 + 0 + 69 + 589 + 0 = 666.

It is a super-2 number, since 2×51200695890² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (51200695891) 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, 94815834 + ... + 94816373.

It is an arithmetic number, because the mean of its divisors is an integer number (4266724680).

Almost surely, 2^51200695890 is an apocalyptic number.

51200695890 is an abundant number, since it is smaller than the sum of its proper divisors (85334493870).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51200695890 is a wasteful number, since it uses less digits than its factorization.

51200695890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189632223 (or 189632217 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 45.

The spelling of 51200695890 in words is "fifty-one billion, two hundred million, six hundred ninety-five thousand, eight hundred ninety".