51621436670 has 32 divisors (see below), whose sum is σ = 97385753088. Its totient is φ = 19663782688.

The previous prime is 51621436651. The next prime is 51621436673. The reversal of 51621436670 is 7663412615.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51621436673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 442154 + ... + 546573.

It is an arithmetic number, because the mean of its divisors is an integer number (3043304784).

Almost surely, 2^51621436670 is an apocalyptic number.

51621436670 is a deficient number, since it is larger than the sum of its proper divisors (45764316418).

51621436670 is a wasteful number, since it uses less digits than its factorization.

51621436670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 988984.

The product of its (nonzero) digits is 181440, while the sum is 41.

The spelling of 51621436670 in words is "fifty-one billion, six hundred twenty-one million, four hundred thirty-six thousand, six hundred seventy".