1051778656 has 24 divisors (see below), whose sum is σ = 2095642584. Its totient is φ = 519552000.

The previous prime is 1051778621. The next prime is 1051778659. The reversal of 1051778656 is 6568771501.

It is a super-2 number, since 2×1051778656² = 2212476682434332672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1051778659) 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, 195345 + ... + 200656.

It is an arithmetic number, because the mean of its divisors is an integer number (87318441).

Almost surely, 2^1051778656 is an apocalyptic number.

1051778656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1051778656 is a deficient number, since it is larger than the sum of its proper divisors (1043863928).

1051778656 is an equidigital number, since it uses as much as digits as its factorization.

1051778656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396094 (or 396086 counting only the distinct ones).

The product of its (nonzero) digits is 352800, while the sum is 46.

The square root of 1051778656 is about 32431.1371370170. The cubic root of 1051778656 is about 1016.9699440046.

The spelling of 1051778656 in words is "one billion, fifty-one million, seven hundred seventy-eight thousand, six hundred fifty-six".