51021601671 has 16 divisors (see below), whose sum is σ = 69552000000. Its totient is φ = 33254381088.

The previous prime is 51021601663. The next prime is 51021601727. The reversal of 51021601671 is 17610612015.

It is not a de Polignac number, because 51021601671 - 2³ = 51021601663 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51021601651) 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, 67296 + ... + 326453.

It is an arithmetic number, because the mean of its divisors is an integer number (4347000000).

Almost surely, 2^51021601671 is an apocalyptic number.

51021601671 is a deficient number, since it is larger than the sum of its proper divisors (18530398329).

51021601671 is a wasteful number, since it uses less digits than its factorization.

51021601671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394718.

The product of its (nonzero) digits is 2520, while the sum is 30.

The spelling of 51021601671 in words is "fifty-one billion, twenty-one million, six hundred one thousand, six hundred seventy-one".