1061671778 has 16 divisors (see below), whose sum is σ = 1676958720. Its totient is φ = 502706736.

The previous prime is 1061671771. The next prime is 1061671801. The reversal of 1061671778 is 8771761601.

It is a super-2 number, since 2×1061671778² = 2254293928403362568, which contains 22 as substring.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1061671771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190175 + ... + 195677.

It is an arithmetic number, because the mean of its divisors is an integer number (104809920).

Almost surely, 2^1061671778 is an apocalyptic number.

1061671778 is a deficient number, since it is larger than the sum of its proper divisors (615286942).

1061671778 is a wasteful number, since it uses less digits than its factorization.

1061671778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10601.

The product of its (nonzero) digits is 98784, while the sum is 44.

The square root of 1061671778 is about 32583.3052037389. The cubic root of 1061671778 is about 1020.1485680043.

The spelling of 1061671778 in words is "one billion, sixty-one million, six hundred seventy-one thousand, seven hundred seventy-eight".