16670001681 has 24 divisors (see below), whose sum is σ = 24167457600. Its totient is φ = 11072539296.

The previous prime is 16670001637. The next prime is 16670001697. The reversal of 16670001681 is 18610007661.

It is not a de Polignac number, because 16670001681 - 2¹⁰ = 16670000657 is a prime.

It is a super-2 number, since 2×16670001681² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16670001181) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2946051 + ... + 2951703.

It is an arithmetic number, because the mean of its divisors is an integer number (1006977400).

Almost surely, 2^16670001681 is an apocalyptic number.

It is an amenable number.

16670001681 is a deficient number, since it is larger than the sum of its proper divisors (7497455919).

16670001681 is a wasteful number, since it uses less digits than its factorization.

16670001681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6805 (or 6802 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The spelling of 16670001681 in words is "sixteen billion, six hundred seventy million, one thousand, six hundred eighty-one".