51261405746 has 8 divisors (see below), whose sum is σ = 77060364060. Its totient is φ = 25574617728.

The previous prime is 51261405743. The next prime is 51261405757. The reversal of 51261405746 is 64750416215.

It can be written as a sum of positive squares in 2 ways, for example, as 50620050121 + 641355625 = 224989^2 + 25325^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 28041431 + ... + 28043258.

Almost surely, 2^51261405746 is an apocalyptic number.

51261405746 is a deficient number, since it is larger than the sum of its proper divisors (25798958314).

51261405746 is a wasteful number, since it uses less digits than its factorization.

51261405746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56085148.

The product of its (nonzero) digits is 201600, while the sum is 41.

The spelling of 51261405746 in words is "fifty-one billion, two hundred sixty-one million, four hundred five thousand, seven hundred forty-six".