164221687990 has 16 divisors (see below), whose sum is σ = 300010965552. Its totient is φ = 64708246944.

The previous prime is 164221687969. The next prime is 164221687997. The reversal of 164221687990 is 99786122461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164221687997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122552829 + ... + 122554168.

It is an arithmetic number, because the mean of its divisors is an integer number (18750685347).

Almost surely, 2^164221687990 is an apocalyptic number.

164221687990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

164221687990 is a deficient number, since it is larger than the sum of its proper divisors (135789277562).

164221687990 is a wasteful number, since it uses less digits than its factorization.

164221687990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245107071.

The product of its (nonzero) digits is 2612736, while the sum is 55.

The spelling of 164221687990 in words is "one hundred sixty-four billion, two hundred twenty-one million, six hundred eighty-seven thousand, nine hundred ninety".