8154507878161 has 4 divisors (see below), whose sum is σ = 8417556519424. Its totient is φ = 7891459236900.

The previous prime is 8154507878123. The next prime is 8154507878201. The reversal of 8154507878161 is 1618787054518.

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 8154507878161 - 2⁴¹ = 5955484622609 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8154507878161.

It is not an unprimeable number, because it can be changed into a prime (8154507878261) 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, 131524320585 + ... + 131524320646.

It is an arithmetic number, because the mean of its divisors is an integer number (2104389129856).

Almost surely, 2^{8154507878161} is an apocalyptic number.

It is an amenable number.

8154507878161 is a deficient number, since it is larger than the sum of its proper divisors (263048641263).

8154507878161 is a wasteful number, since it uses less digits than its factorization.

8154507878161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263048641262.

The product of its (nonzero) digits is 15052800, while the sum is 61.

The spelling of 8154507878161 in words is "eight trillion, one hundred fifty-four billion, five hundred seven million, eight hundred seventy-eight thousand, one hundred sixty-one".