18073778437 has 16 divisors (see below), whose sum is σ = 21386312640. Its totient is φ = 15057676800.

The previous prime is 18073778423. The next prime is 18073778467. The reversal of 18073778437 is 73487737081.

It is a cyclic number.

It is not a de Polignac number, because 18073778437 - 2⁷ = 18073778309 is a prime.

It is a super-2 number, since 2×18073778437² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18073778417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 434764 + ... + 474517.

It is an arithmetic number, because the mean of its divisors is an integer number (1336644540).

Almost surely, 2^18073778437 is an apocalyptic number.

It is an amenable number.

18073778437 is a deficient number, since it is larger than the sum of its proper divisors (3312534203).

18073778437 is a wasteful number, since it uses less digits than its factorization.

18073778437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909444.

The product of its (nonzero) digits is 5531904, while the sum is 55.

The spelling of 18073778437 in words is "eighteen billion, seventy-three million, seven hundred seventy-eight thousand, four hundred thirty-seven".