18197339659490 has 32 divisors (see below), whose sum is σ = 33348966490944. Its totient is φ = 7147675719360.

The previous prime is 18197339659399. The next prime is 18197339659519. The reversal of 18197339659490 is 9495693379181.

It is a super-2 number, since 2×18197339659490² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42627056 + ... + 43051835.

It is an arithmetic number, because the mean of its divisors is an integer number (1042155202842).

Almost surely, 2^{18197339659490} is an apocalyptic number.

18197339659490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18197339659490 is a deficient number, since it is larger than the sum of its proper divisors (15151626831454).

18197339659490 is a wasteful number, since it uses less digits than its factorization.

18197339659490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85679282.

The product of its (nonzero) digits is 396809280, while the sum is 74.

The spelling of 18197339659490 in words is "eighteen trillion, one hundred ninety-seven billion, three hundred thirty-nine million, six hundred fifty-nine thousand, four hundred ninety".