201866086978 has 8 divisors (see below), whose sum is σ = 302875471872. Its totient is φ = 100907596356.

The previous prime is 201866086949. The next prime is 201866086987. The reversal of 201866086978 is 879680668102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×201866086978² (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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12713650 + ... + 12729517.

It is an arithmetic number, because the mean of its divisors is an integer number (37859433984).

Almost surely, 2^201866086978 is an apocalyptic number.

201866086978 is a deficient number, since it is larger than the sum of its proper divisors (101009384894).

201866086978 is a wasteful number, since it uses less digits than its factorization.

201866086978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25447136.

The product of its (nonzero) digits is 13934592, while the sum is 61.

The spelling of 201866086978 in words is "two hundred one billion, eight hundred sixty-six million, eighty-six thousand, nine hundred seventy-eight".