1278055161 has 12 divisors (see below), whose sum is σ = 1885358592. Its totient is φ = 833908056.

The previous prime is 1278055153. The next prime is 1278055243. The reversal of 1278055161 is 1615508721.

1278055161 is a `hidden beast` number, since 1 + 27 + 80 + 551 + 6 + 1 = 666.

1278055161 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1278055161 - 2³ = 1278055153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1278055151) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1510281 + ... + 1511126.

It is an arithmetic number, because the mean of its divisors is an integer number (157113216).

Almost surely, 2^1278055161 is an apocalyptic number.

It is an amenable number.

1278055161 is a deficient number, since it is larger than the sum of its proper divisors (607303431).

1278055161 is a wasteful number, since it uses less digits than its factorization.

1278055161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3021460 (or 3021457 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 36.

The square root of 1278055161 is about 35749.8973564960. The cubic root of 1278055161 is about 1085.2168610960.

The spelling of 1278055161 in words is "one billion, two hundred seventy-eight million, fifty-five thousand, one hundred sixty-one".