1853701668666 has 20 divisors (see below), whose sum is σ = 4153664850522. Its totient is φ = 617900556168.

The previous prime is 1853701668619. The next prime is 1853701668671. The reversal of 1853701668666 is 6668661073581.

It can be written as a sum of positive squares in only one way, i.e., 1670414078025 + 183287590641 = 1292445^2 + 428121^2 .

It is a super-2 number, since 2×1853701668666² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 5721301285 + ... + 5721301608.

Almost surely, 2^{1853701668666} is an apocalyptic number.

1853701668666 is an abundant number, since it is smaller than the sum of its proper divisors (2299963181856).

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

1853701668666 is a wasteful number, since it uses less digits than its factorization.

1853701668666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11442602907 (or 11442602898 counting only the distinct ones).

The product of its (nonzero) digits is 52254720, while the sum is 63.

The spelling of 1853701668666 in words is "one trillion, eight hundred fifty-three billion, seven hundred one million, six hundred sixty-eight thousand, six hundred sixty-six".