164646451866 has 16 divisors (see below), whose sum is σ = 354623127264. Its totient is φ = 50660446704.

The previous prime is 164646451861. The next prime is 164646451867. The reversal of 164646451866 is 668154646461.

It is a happy number.

It is a super-2 number, since 2×164646451866² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (164646451861) 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, 1055425896 + ... + 1055426051.

It is an arithmetic number, because the mean of its divisors is an integer number (22163945454).

Almost surely, 2^164646451866 is an apocalyptic number.

164646451866 is an abundant number, since it is smaller than the sum of its proper divisors (189976675398).

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

164646451866 is a wasteful number, since it uses less digits than its factorization.

164646451866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2110851965.

The product of its digits is 19906560, while the sum is 57.

The spelling of 164646451866 in words is "one hundred sixty-four billion, six hundred forty-six million, four hundred fifty-one thousand, eight hundred sixty-six".