51664332040 has 64 divisors (see below), whose sum is σ = 117672030720. Its totient is φ = 20412960000.

The previous prime is 51664331977. The next prime is 51664332047. The reversal of 51664332040 is 4023346615.

51664332040 = T₃₀₃ + T₃₀₄ + ... + T₆₇₆₇.

It is a junction number, because it is equal to n+sod(n) for n = 51664331987 and 51664332005.

It is not an unprimeable number, because it can be changed into a prime (51664332047) 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, 1726405 + ... + 1756075.

It is an arithmetic number, because the mean of its divisors is an integer number (1838625480).

Almost surely, 2^51664332040 is an apocalyptic number.

It is an amenable number.

51664332040 is an abundant number, since it is smaller than the sum of its proper divisors (66007698680).

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

51664332040 is a wasteful number, since it uses less digits than its factorization.

51664332040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30214 (or 30210 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 34.

Adding to 51664332040 its reverse (4023346615), we get a palindrome (55687678655).

The spelling of 51664332040 in words is "fifty-one billion, six hundred sixty-four million, three hundred thirty-two thousand, forty".