1266357878 has 8 divisors (see below), whose sum is σ = 1899873768. Its totient is φ = 633066624.

The previous prime is 1266357871. The next prime is 1266357889. The reversal of 1266357878 is 8787536621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266357871) 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, 41276 + ... + 65087.

It is an arithmetic number, because the mean of its divisors is an integer number (237484221).

Almost surely, 2^1266357878 is an apocalyptic number.

1266357878 is a deficient number, since it is larger than the sum of its proper divisors (633515890).

1266357878 is a wasteful number, since it uses less digits than its factorization.

1266357878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112318.

The product of its digits is 3386880, while the sum is 53.

The square root of 1266357878 is about 35585.9224694260. The cubic root of 1266357878 is about 1081.8959261797.

The spelling of 1266357878 in words is "one billion, two hundred sixty-six million, three hundred fifty-seven thousand, eight hundred seventy-eight".