51621131532066 has 8 divisors (see below), whose sum is σ = 103242263064144. Its totient is φ = 17207043844020.

The previous prime is 51621131532029. The next prime is 51621131532107. The reversal of 51621131532066 is 66023513112615.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

51621131532066 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4301760961000 + ... + 4301760961011.

It is an arithmetic number, because the mean of its divisors is an integer number (12905282883018).

Almost surely, 2^{51621131532066} is an apocalyptic number.

51621131532066 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

51621131532066 is a wasteful number, since it uses less digits than its factorization.

51621131532066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8603521922016.

The product of its (nonzero) digits is 194400, while the sum is 42.

The spelling of 51621131532066 in words is "fifty-one trillion, six hundred twenty-one billion, one hundred thirty-one million, five hundred thirty-two thousand, sixty-six".