51970821803 has 2 divisors, whose sum is σ = 51970821804. Its totient is φ = 51970821802.

The previous prime is 51970821761. The next prime is 51970821811. The reversal of 51970821803 is 30812807915.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51970821803 - 2⁶ = 51970821739 is a prime.

It is not a weakly prime, because it can be changed into another prime (51970821883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25985410901 + 25985410902.

It is an arithmetic number, because the mean of its divisors is an integer number (25985410902).

Almost surely, 2^51970821803 is an apocalyptic number.

51970821803 is a deficient number, since it is larger than the sum of its proper divisors (1).

51970821803 is an equidigital number, since it uses as much as digits as its factorization.

51970821803 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 44.

The spelling of 51970821803 in words is "fifty-one billion, nine hundred seventy million, eight hundred twenty-one thousand, eight hundred three".