1051661278 has 16 divisors (see below), whose sum is σ = 1634359680. Its totient is φ = 506929696.

The previous prime is 1051661257. The next prime is 1051661333. The reversal of 1051661278 is 8721661501.

It is a super-2 number, since 2×1051661278² = 2211982887289186568, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25875 + ... + 52657.

It is an arithmetic number, because the mean of its divisors is an integer number (102147480).

Almost surely, 2^1051661278 is an apocalyptic number.

1051661278 is a deficient number, since it is larger than the sum of its proper divisors (582698402).

1051661278 is a wasteful number, since it uses less digits than its factorization.

1051661278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27491.

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

The square root of 1051661278 is about 32429.3274367508. The cubic root of 1051661278 is about 1016.9321114758.

The spelling of 1051661278 in words is "one billion, fifty-one million, six hundred sixty-one thousand, two hundred seventy-eight".