170321840649081 has 81 divisors (see below), whose sum is σ = 275121261845157. Its totient is φ = 101460636771120.

The previous prime is 170321840649073. The next prime is 170321840649089. The reversal of 170321840649081 is 180946048123071.

The square root of 170321840649081 is 13050741.

It is a perfect power (a square), and thus also a powerful number.

170321840649081 is a `hidden beast` number, since 1 + 7 + 0 + 32 + 1 + 8 + 40 + 6 + 490 + 81 = 666.

It is an interprime number because it is at equal distance from previous prime (170321840649073) and next prime (170321840649089).

It is not a de Polignac number, because 170321840649081 - 2³ = 170321840649073 is a prime.

It is a super-2 number, since 2×170321840649081² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (170321840649089) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 25409789376 + ... + 25409796078.

Almost surely, 2^{170321840649081} is an apocalyptic number.

170321840649081 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

170321840649081 is the 13050741-st square number.

170321840649081 is the 6525371-st centered octagonal number.

It is an amenable number.

170321840649081 is a deficient number, since it is larger than the sum of its proper divisors (104799421196076).

170321840649081 is an frugal number, since it uses more digits than its factorization.

170321840649081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13552 (or 6776 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 54.

The spelling of 170321840649081 in words is "one hundred seventy trillion, three hundred twenty-one billion, eight hundred forty million, six hundred forty-nine thousand, eighty-one".