1008278778251 has 4 divisors (see below), whose sum is σ = 1008343505904. Its totient is φ = 1008214050600.

The previous prime is 1008278778209. The next prime is 1008278778259. The reversal of 1008278778251 is 1528778728001.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1008278778251 - 2³⁴ = 991098909067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1008278778259) 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, 32340455 + ... + 32371616.

It is an arithmetic number, because the mean of its divisors is an integer number (252085876476).

Almost surely, 2^{1008278778251} is an apocalyptic number.

1008278778251 is a deficient number, since it is larger than the sum of its proper divisors (64727653).

1008278778251 is an equidigital number, since it uses as much as digits as its factorization.

1008278778251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64727652.

The product of its (nonzero) digits is 3512320, while the sum is 56.

The spelling of 1008278778251 in words is "one trillion, eight billion, two hundred seventy-eight million, seven hundred seventy-eight thousand, two hundred fifty-one".