2016861988 has 6 divisors (see below), whose sum is σ = 3529508486. Its totient is φ = 1008430992.

The previous prime is 2016861949. The next prime is 2016861991. The reversal of 2016861988 is 8891686102.

It can be written as a sum of positive squares in only one way, i.e., 1335025444 + 681836544 = 36538^2 + 26112^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252107745 + ... + 252107752.

Almost surely, 2^2016861988 is an apocalyptic number.

It is an amenable number.

2016861988 is a deficient number, since it is larger than the sum of its proper divisors (1512646498).

2016861988 is a wasteful number, since it uses less digits than its factorization.

2016861988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 504215501 (or 504215499 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 49.

The square root of 2016861988 is about 44909.4866147454. The cubic root of 2016861988 is about 1263.4519410382.

The spelling of 2016861988 in words is "two billion, sixteen million, eight hundred sixty-one thousand, nine hundred eighty-eight".