51881149699 has 2 divisors, whose sum is σ = 51881149700. Its totient is φ = 51881149698.

The previous prime is 51881149693. The next prime is 51881149783. The reversal of 51881149699 is 99694118815.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51881149699 - 2⁵ = 51881149667 is a prime.

It is not a weakly prime, because it can be changed into another prime (51881149693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25940574849 + 25940574850.

It is an arithmetic number, because the mean of its divisors is an integer number (25940574850).

Almost surely, 2^51881149699 is an apocalyptic number.

51881149699 is a deficient number, since it is larger than the sum of its proper divisors (1).

51881149699 is an equidigital number, since it uses as much as digits as its factorization.

51881149699 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5598720, while the sum is 61.

The spelling of 51881149699 in words is "fifty-one billion, eight hundred eighty-one million, one hundred forty-nine thousand, six hundred ninety-nine".