51485720225 has 12 divisors (see below), whose sum is σ = 66618045696. Its totient is φ = 39397768080.

The previous prime is 51485720201. The next prime is 51485720257. The reversal of 51485720225 is 52202758415.

It is not a de Polignac number, because 51485720225 - 2⁶ = 51485720161 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44769617 + ... + 44770766.

It is an arithmetic number, because the mean of its divisors is an integer number (5551503808).

Almost surely, 2^51485720225 is an apocalyptic number.

It is an amenable number.

51485720225 is a deficient number, since it is larger than the sum of its proper divisors (15132325471).

51485720225 is a wasteful number, since it uses less digits than its factorization.

51485720225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89540416 (or 89540411 counting only the distinct ones).

The product of its (nonzero) digits is 224000, while the sum is 41.

The spelling of 51485720225 in words is "fifty-one billion, four hundred eighty-five million, seven hundred twenty thousand, two hundred twenty-five".