51020521145 has 32 divisors (see below), whose sum is σ = 67435200000. Its totient is φ = 36749134080.

The previous prime is 51020521133. The next prime is 51020521217. The reversal of 51020521145 is 54112502015.

It is not a de Polignac number, because 51020521145 - 2²⁶ = 50953412281 is a prime.

It is a super-2 number, since 2×51020521145² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2851136 + ... + 2868974.

It is an arithmetic number, because the mean of its divisors is an integer number (2107350000).

Almost surely, 2^51020521145 is an apocalyptic number.

51020521145 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51020521145 is a deficient number, since it is larger than the sum of its proper divisors (16414678855).

51020521145 is a wasteful number, since it uses less digits than its factorization.

51020521145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18353.

The product of its (nonzero) digits is 2000, while the sum is 26.

The spelling of 51020521145 in words is "fifty-one billion, twenty million, five hundred twenty-one thousand, one hundred forty-five".