51557570747 has 2 divisors, whose sum is σ = 51557570748. Its totient is φ = 51557570746.

The previous prime is 51557570741. The next prime is 51557570761. The reversal of 51557570747 is 74707575515.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51557570747 - 2¹² = 51557566651 is a prime.

It is not a weakly prime, because it can be changed into another prime (51557570741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25778785373 + 25778785374.

It is an arithmetic number, because the mean of its divisors is an integer number (25778785374).

Almost surely, 2^51557570747 is an apocalyptic number.

51557570747 is a deficient number, since it is larger than the sum of its proper divisors (1).

51557570747 is an equidigital number, since it uses as much as digits as its factorization.

51557570747 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6002500, while the sum is 53.

The spelling of 51557570747 in words is "fifty-one billion, five hundred fifty-seven million, five hundred seventy thousand, seven hundred forty-seven".