18278797051 has 4 divisors (see below), whose sum is σ = 18279838192. Its totient is φ = 18277755912.

The previous prime is 18278797013. The next prime is 18278797081. The reversal of 18278797051 is 15079787281.

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 18278797051 - 2⁹ = 18278796539 is a prime.

It is a super-2 number, since 2×18278797051² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18278796983 and 18278797001.

It is not an unprimeable number, because it can be changed into a prime (18278797081) 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, 493776 + ... + 529501.

It is an arithmetic number, because the mean of its divisors is an integer number (4569959548).

Almost surely, 2^18278797051 is an apocalyptic number.

18278797051 is a deficient number, since it is larger than the sum of its proper divisors (1041141).

18278797051 is a wasteful number, since it uses less digits than its factorization.

18278797051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1041140.

The product of its (nonzero) digits is 1975680, while the sum is 55.

The spelling of 18278797051 in words is "eighteen billion, two hundred seventy-eight million, seven hundred ninety-seven thousand, fifty-one".