199690012178 has 16 divisors (see below), whose sum is σ = 305212834080. Its totient is φ = 97969528800.

The previous prime is 199690012169. The next prime is 199690012201. The reversal of 199690012178 is 871210096991.

It is a super-2 number, since 2×199690012178² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4258568 + ... + 4305203.

It is an arithmetic number, because the mean of its divisors is an integer number (19075802130).

Almost surely, 2^199690012178 is an apocalyptic number.

199690012178 is a deficient number, since it is larger than the sum of its proper divisors (105522821902).

199690012178 is a wasteful number, since it uses less digits than its factorization.

199690012178 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8563993.

The product of its (nonzero) digits is 489888, while the sum is 53.

The spelling of 199690012178 in words is "one hundred ninety-nine billion, six hundred ninety million, twelve thousand, one hundred seventy-eight".