101666439 has 24 divisors (see below), whose sum is σ = 169327392. Its totient is φ = 57576960.

The previous prime is 101666419. The next prime is 101666441. The reversal of 101666439 is 934666101.

It is not a de Polignac number, because 101666439 - 2¹¹ = 101664391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101666419) 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, 22 + ... + 14259.

It is an arithmetic number, because the mean of its divisors is an integer number (7055308).

Almost surely, 2^101666439 is an apocalyptic number.

101666439 is a deficient number, since it is larger than the sum of its proper divisors (67660953).

101666439 is a wasteful number, since it uses less digits than its factorization.

101666439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14407 (or 14404 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 101666439 is about 10082.9776851880. The cubic root of 101666439 is about 466.7230007390.

The spelling of 101666439 in words is "one hundred one million, six hundred sixty-six thousand, four hundred thirty-nine".