1816620966 has 32 divisors (see below), whose sum is σ = 4044250080. Its totient is φ = 604443168.

The previous prime is 1816620943. The next prime is 1816620979. The reversal of 1816620966 is 6690266181.

1816620966 is a `hidden beast` number, since 1 + 8 + 16 + 620 + 9 + 6 + 6 = 666.

It is a super-2 number, since 2×1816620966² = 6600223468221546312, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121 + ... + 60276.

It is an arithmetic number, because the mean of its divisors is an integer number (126382815).

Almost surely, 2^1816620966 is an apocalyptic number.

1816620966 is an abundant number, since it is smaller than the sum of its proper divisors (2227629114).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1816620966 is a wasteful number, since it uses less digits than its factorization.

1816620966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60965 (or 60959 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 1816620966 is about 42621.8367271989. The cubic root of 1816620966 is about 1220.1730843742.

The spelling of 1816620966 in words is "one billion, eight hundred sixteen million, six hundred twenty thousand, nine hundred sixty-six".