149864833681 has 4 divisors (see below), whose sum is σ = 149908138164. Its totient is φ = 149821529200.

The previous prime is 149864833661. The next prime is 149864833687. The reversal of 149864833681 is 186338468941.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 59333652225 + 90531181456 = 243585^2 + 300884^2 .

It is a cyclic number.

It is not a de Polignac number, because 149864833681 - 2⁵ = 149864833649 is a prime.

It is a super-2 number, since 2×149864833681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (149864833687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21647050 + ... + 21653971.

It is an arithmetic number, because the mean of its divisors is an integer number (37477034541).

Almost surely, 2^149864833681 is an apocalyptic number.

It is an amenable number.

149864833681 is a deficient number, since it is larger than the sum of its proper divisors (43304483).

149864833681 is an equidigital number, since it uses as much as digits as its factorization.

149864833681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43304482.

The product of its digits is 23887872, while the sum is 61.

The spelling of 149864833681 in words is "one hundred forty-nine billion, eight hundred sixty-four million, eight hundred thirty-three thousand, six hundred eighty-one".