149681816549 has 4 divisors (see below), whose sum is σ = 149710436160. Its totient is φ = 149653196940.

The previous prime is 149681816527. The next prime is 149681816621. The reversal of 149681816549 is 945618186941.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 149681816549 - 2⁸ = 149681816293 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 149681816491 and 149681816500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149681816509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14301959 + ... + 14312420.

It is an arithmetic number, because the mean of its divisors is an integer number (37427609040).

Almost surely, 2^149681816549 is an apocalyptic number.

It is an amenable number.

149681816549 is a deficient number, since it is larger than the sum of its proper divisors (28619611).

149681816549 is an equidigital number, since it uses as much as digits as its factorization.

149681816549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28619610.

The product of its digits is 14929920, while the sum is 62.

The spelling of 149681816549 in words is "one hundred forty-nine billion, six hundred eighty-one million, eight hundred sixteen thousand, five hundred forty-nine".