18196739509 has 32 divisors (see below), whose sum is σ = 20165370624. Its totient is φ = 16317987840.

The previous prime is 18196739479. The next prime is 18196739513. The reversal of 18196739509 is 90593769181.

It is a cyclic number.

It is not a de Polignac number, because 18196739509 - 2¹³ = 18196731317 is a prime.

It is a super-2 number, since 2×18196739509² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18196739549) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28837624 + ... + 28838254.

It is an arithmetic number, because the mean of its divisors is an integer number (630167832).

Almost surely, 2^18196739509 is an apocalyptic number.

It is an amenable number.

18196739509 is a deficient number, since it is larger than the sum of its proper divisors (1968631115).

18196739509 is a wasteful number, since it uses less digits than its factorization.

18196739509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1117.

The product of its (nonzero) digits is 3674160, while the sum is 58.

The spelling of 18196739509 in words is "eighteen billion, one hundred ninety-six million, seven hundred thirty-nine thousand, five hundred nine".