51201100206 has 24 divisors (see below), whose sum is σ = 110941328160. Its totient is φ = 17066170176.

The previous prime is 51201100199. The next prime is 51201100207. The reversal of 51201100206 is 60200110215.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51201100207) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 365830 + ... + 486038.

It is an arithmetic number, because the mean of its divisors is an integer number (4622555340).

Almost surely, 2^51201100206 is an apocalyptic number.

51201100206 is an abundant number, since it is smaller than the sum of its proper divisors (59740227954).

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

51201100206 is a wasteful number, since it uses less digits than its factorization.

51201100206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143880 (or 143877 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The spelling of 51201100206 in words is "fifty-one billion, two hundred one million, one hundred thousand, two hundred six".