815897027149 has 4 divisors (see below), whose sum is σ = 815948882080. Its totient is φ = 815845172220.

The previous prime is 815897027129. The next prime is 815897027201. The reversal of 815897027149 is 941720798518.

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 a de Polignac number, because none of the positive numbers 2^k-815897027149 is a prime.

It is a super-3 number, since 3×815897027149³ (a number of 37 digits) contains 333 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 (815897027129) 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, 25903857 + ... + 25935334.

It is an arithmetic number, because the mean of its divisors is an integer number (203987220520).

Almost surely, 2^815897027149 is an apocalyptic number.

It is an amenable number.

815897027149 is a deficient number, since it is larger than the sum of its proper divisors (51854931).

815897027149 is a wasteful number, since it uses less digits than its factorization.

815897027149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51854930.

The product of its (nonzero) digits is 10160640, while the sum is 61.

The spelling of 815897027149 in words is "eight hundred fifteen billion, eight hundred ninety-seven million, twenty-seven thousand, one hundred forty-nine".