18037213651 has 4 divisors (see below), whose sum is σ = 18041423400. Its totient is φ = 18033003904.

The previous prime is 18037213643. The next prime is 18037213699. The reversal of 18037213651 is 15631273081.

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 18037213651 - 2³ = 18037213643 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18037213651.

It is not an unprimeable number, because it can be changed into a prime (18037213751) 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, 2098441 + ... + 2107018.

It is an arithmetic number, because the mean of its divisors is an integer number (4510355850).

Almost surely, 2^18037213651 is an apocalyptic number.

18037213651 is a deficient number, since it is larger than the sum of its proper divisors (4209749).

18037213651 is an equidigital number, since it uses as much as digits as its factorization.

18037213651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4209748.

The product of its (nonzero) digits is 30240, while the sum is 37.

The spelling of 18037213651 in words is "eighteen billion, thirty-seven million, two hundred thirteen thousand, six hundred fifty-one".