51666199204 has 27 divisors (see below), whose sum is σ = 93665046657. Its totient is φ = 24935938608.

The previous prime is 51666199171. The next prime is 51666199219. The reversal of 51666199204 is 40299166615.

The square root of 51666199204 is 227302.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 27092501604 + 24573697600 = 164598^2 + 156760^2 .

It is a super-2 number, since 2×51666199204² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 13181557 + ... + 13185475.

Almost surely, 2^51666199204 is an apocalyptic number.

51666199204 is the 227302-nd square number.

It is an amenable number.

51666199204 is a deficient number, since it is larger than the sum of its proper divisors (41998847453).

51666199204 is an frugal number, since it uses more digits than its factorization.

51666199204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7900 (or 3950 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 49.

Multiplying 51666199204 by its sum of digits (49), we get a square (2531643760996 = 1591114²).

The spelling of 51666199204 in words is "fifty-one billion, six hundred sixty-six million, one hundred ninety-nine thousand, two hundred four".