1016561278 has 4 divisors (see below), whose sum is σ = 1524841920. Its totient is φ = 508280638.

The previous prime is 1016561251. The next prime is 1016561309. The reversal of 1016561278 is 8721656101.

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

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254140318 + ... + 254140321.

It is an arithmetic number, because the mean of its divisors is an integer number (381210480).

Almost surely, 2^1016561278 is an apocalyptic number.

1016561278 is a deficient number, since it is larger than the sum of its proper divisors (508280642).

1016561278 is an equidigital number, since it uses as much as digits as its factorization.

1016561278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508280641.

The product of its (nonzero) digits is 20160, while the sum is 37.

The square root of 1016561278 is about 31883.5581138618. The cubic root of 1016561278 is about 1005.4902282307.

The spelling of 1016561278 in words is "one billion, sixteen million, five hundred sixty-one thousand, two hundred seventy-eight".