51660899 has 2 divisors, whose sum is σ = 51660900. Its totient is φ = 51660898.

The previous prime is 51660883. The next prime is 51660901. The reversal of 51660899 is 99806615.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51660899 - 2⁴ = 51660883 is a prime.

Together with 51660901, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51660299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25830449 + 25830450.

It is an arithmetic number, because the mean of its divisors is an integer number (25830450).

Almost surely, 2^51660899 is an apocalyptic number.

51660899 is a deficient number, since it is larger than the sum of its proper divisors (1).

51660899 is an equidigital number, since it uses as much as digits as its factorization.

51660899 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 116640, while the sum is 44.

The square root of 51660899 is about 7187.5516693795. The cubic root of 51660899 is about 372.4380005817.

The spelling of 51660899 in words is "fifty-one million, six hundred sixty thousand, eight hundred ninety-nine".