166138464 has 48 divisors (see below), whose sum is σ = 444355632. Its totient is φ = 54332928.

The previous prime is 166138463. The next prime is 166138471. The reversal of 166138464 is 464831661.

It is a tau number, because it is divible by the number of its divisors (48).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166138463) 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, 11239 + ... + 21414.

It is an arithmetic number, because the mean of its divisors is an integer number (9257409).

Almost surely, 2^166138464 is an apocalyptic number.

It is an amenable number.

166138464 is an abundant number, since it is smaller than the sum of its proper divisors (278217168).

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

166138464 is a wasteful number, since it uses less digits than its factorization.

166138464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32719 (or 32711 counting only the distinct ones).

The product of its digits is 82944, while the sum is 39.

The square root of 166138464 is about 12889.4710519866. The cubic root of 166138464 is about 549.7392306520.

The spelling of 166138464 in words is "one hundred sixty-six million, one hundred thirty-eight thousand, four hundred sixty-four".