18012721351 has 8 divisors (see below), whose sum is σ = 18369373104. Its totient is φ = 17656691520.

The previous prime is 18012721343. The next prime is 18012721357. The reversal of 18012721351 is 15312721081.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18012721351 - 2³ = 18012721343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18012721357) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96765 + ... + 213046.

It is an arithmetic number, because the mean of its divisors is an integer number (2296171638).

Almost surely, 2^18012721351 is an apocalyptic number.

18012721351 is a deficient number, since it is larger than the sum of its proper divisors (356651753).

18012721351 is a wasteful number, since it uses less digits than its factorization.

18012721351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310961.

The product of its (nonzero) digits is 3360, while the sum is 31.

The spelling of 18012721351 in words is "eighteen billion, twelve million, seven hundred twenty-one thousand, three hundred fifty-one".