19970987373666 has 192 divisors, whose sum is σ = 53197212257280. Its totient is φ = 5287652472960.

The previous prime is 19970987373653. The next prime is 19970987373677. The reversal of 19970987373666 is 66637378907991.

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 95 ways as a sum of consecutive naturals, for example, 41760181 + ... + 42235703.

It is an arithmetic number, because the mean of its divisors is an integer number (277068813840).

Almost surely, 2^{19970987373666} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19970987373666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26598606128640).

19970987373666 is an abundant number, since it is smaller than the sum of its proper divisors (33226224883614).

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

19970987373666 is a wasteful number, since it uses less digits than its factorization.

19970987373666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475941 (or 475938 counting only the distinct ones).

The product of its (nonzero) digits is 3888730944, while the sum is 81.

The spelling of 19970987373666 in words is "nineteen trillion, nine hundred seventy billion, nine hundred eighty-seven million, three hundred seventy-three thousand, six hundred sixty-six".