101666541 has 4 divisors (see below), whose sum is σ = 135555392. Its totient is φ = 67777692.

The previous prime is 101666527. The next prime is 101666557. The reversal of 101666541 is 145666101.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 101666541 - 2¹⁸ = 101404397 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101666499 and 101666508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101666501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16944421 + ... + 16944426.

It is an arithmetic number, because the mean of its divisors is an integer number (33888848).

Almost surely, 2^101666541 is an apocalyptic number.

It is an amenable number.

101666541 is a deficient number, since it is larger than the sum of its proper divisors (33888851).

101666541 is an equidigital number, since it uses as much as digits as its factorization.

101666541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33888850.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 101666541 is about 10082.9827432164. The cubic root of 101666541 is about 466.7231568237.

The spelling of 101666541 in words is "one hundred one million, six hundred sixty-six thousand, five hundred forty-one".