161366659890 has 32 divisors (see below), whose sum is σ = 387560517696. Its totient is φ = 42999938880.

The previous prime is 161366659873. The next prime is 161366659931. The reversal of 161366659890 is 98956663161.

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, 1906032 + ... + 1988891.

It is an arithmetic number, because the mean of its divisors is an integer number (12111266178).

Almost surely, 2^161366659890 is an apocalyptic number.

161366659890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161366659890 is an abundant number, since it is smaller than the sum of its proper divisors (226193857806).

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

161366659890 is a wasteful number, since it uses less digits than its factorization.

161366659890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3896314.

The product of its (nonzero) digits is 12597120, while the sum is 60.

The spelling of 161366659890 in words is "one hundred sixty-one billion, three hundred sixty-six million, six hundred fifty-nine thousand, eight hundred ninety".