205418692051 has 4 divisors (see below), whose sum is σ = 212045101504. Its totient is φ = 198792282600.

The previous prime is 205418692021. The next prime is 205418692069. The reversal of 205418692051 is 150296814502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 205418692051 - 2²¹ = 205416594899 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 205418691989 and 205418692007.

It is not an unprimeable number, because it can be changed into a prime (205418692021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3313204680 + ... + 3313204741.

It is an arithmetic number, because the mean of its divisors is an integer number (53011275376).

Almost surely, 2^205418692051 is an apocalyptic number.

205418692051 is a deficient number, since it is larger than the sum of its proper divisors (6626409453).

205418692051 is an equidigital number, since it uses as much as digits as its factorization.

205418692051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6626409452.

The product of its (nonzero) digits is 172800, while the sum is 43.

The spelling of 205418692051 in words is "two hundred five billion, four hundred eighteen million, six hundred ninety-two thousand, fifty-one".