18120653397 has 48 divisors (see below), whose sum is σ = 34067304000. Its totient is φ = 9413318880.

The previous prime is 18120653387. The next prime is 18120653429. The reversal of 18120653397 is 79335602181.

18120653397 is a `hidden beast` number, since 1 + 8 + 1 + 20 + 6 + 533 + 97 = 666.

It is not a de Polignac number, because 18120653397 - 2⁶ = 18120653333 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18120653347) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 608022 + ... + 637127.

It is an arithmetic number, because the mean of its divisors is an integer number (709735500).

Almost surely, 2^18120653397 is an apocalyptic number.

It is an amenable number.

18120653397 is a deficient number, since it is larger than the sum of its proper divisors (15946650603).

18120653397 is a wasteful number, since it uses less digits than its factorization.

18120653397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1245183 (or 1245170 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The spelling of 18120653397 in words is "eighteen billion, one hundred twenty million, six hundred fifty-three thousand, three hundred ninety-seven".