1951661165168 has 40 divisors (see below), whose sum is σ = 4442417552496. Its totient is φ = 818878809600.

The previous prime is 1951661165057. The next prime is 1951661165177. The reversal of 1951661165168 is 8615611661591.

It is a congruent number.

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, 426497093 + ... + 426501668.

Almost surely, 2^{1951661165168} is an apocalyptic number.

It is an amenable number.

1951661165168 is an abundant number, since it is smaller than the sum of its proper divisors (2490756387328).

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

1951661165168 is a wasteful number, since it uses less digits than its factorization.

1951661165168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 852998793 (or 852998787 counting only the distinct ones).

The product of its digits is 2332800, while the sum is 56.

The spelling of 1951661165168 in words is "one trillion, nine hundred fifty-one billion, six hundred sixty-one million, one hundred sixty-five thousand, one hundred sixty-eight".