51261405745 has 16 divisors (see below), whose sum is σ = 68666444352. Its totient is φ = 36414020160.

The previous prime is 51261405743. The next prime is 51261405757. The reversal of 51261405745 is 54750416215.

It is not a de Polignac number, because 51261405745 - 2¹ = 51261405743 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51261405698 and 51261405707.

It is not an unprimeable number, because it can be changed into a prime (51261405743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10835142 + ... + 10839871.

It is an arithmetic number, because the mean of its divisors is an integer number (4291652772).

Almost surely, 2^51261405745 is an apocalyptic number.

51261405745 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51261405745 is a deficient number, since it is larger than the sum of its proper divisors (17405038607).

51261405745 is a wasteful number, since it uses less digits than its factorization.

51261405745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21675072.

The product of its (nonzero) digits is 168000, while the sum is 40.

The spelling of 51261405745 in words is "fifty-one billion, two hundred sixty-one million, four hundred five thousand, seven hundred forty-five".