1866778334 has 12 divisors (see below), whose sum is σ = 2823257472. Its totient is φ = 925698060.

The previous prime is 1866778327. The next prime is 1866778337. The reversal of 1866778334 is 4338776681.

It is a super-2 number, since 2×1866778334² = 6969722696583631112, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1866778337) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 687239 + ... + 689949.

It is an arithmetic number, because the mean of its divisors is an integer number (235271456).

Almost surely, 2^1866778334 is an apocalyptic number.

1866778334 is a deficient number, since it is larger than the sum of its proper divisors (956479138).

1866778334 is an frugal number, since it uses more digits than its factorization.

1866778334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5551 (or 2840 counting only the distinct ones).

The product of its digits is 4064256, while the sum is 53.

The square root of 1866778334 is about 43206.2302683305. The cubic root of 1866778334 is about 1231.3010521953.

The spelling of 1866778334 in words is "one billion, eight hundred sixty-six million, seven hundred seventy-eight thousand, three hundred thirty-four".