201861866508 has 24 divisors (see below), whose sum is σ = 471018438912. Its totient is φ = 67286229264.

The previous prime is 201861866489. The next prime is 201861866527. The reversal of 201861866508 is 805668168102.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (201861866489) and next prime (201861866527).

It is a super-2 number, since 2×201861866508² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1187641 + ... + 1346927.

It is an arithmetic number, because the mean of its divisors is an integer number (19625768288).

Almost surely, 2^201861866508 is an apocalyptic number.

It is an amenable number.

201861866508 is an abundant number, since it is smaller than the sum of its proper divisors (269156572404).

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

201861866508 is a wasteful number, since it uses less digits than its factorization.

201861866508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264901 (or 264899 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 51.

The spelling of 201861866508 in words is "two hundred one billion, eight hundred sixty-one million, eight hundred sixty-six thousand, five hundred eight".