166240523 has 4 divisors (see below), whose sum is σ = 166278960. Its totient is φ = 166202088.

The previous prime is 166240517. The next prime is 166240541. The reversal of 166240523 is 325042661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 325042661 = 67 ⋅4851383.

It is a cyclic number.

It is not a de Polignac number, because 166240523 - 2²² = 162046219 is a prime.

It is a super-2 number, since 2×166240523² = 55271822974627058, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166243523) 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, 11768 + ... + 21701.

It is an arithmetic number, because the mean of its divisors is an integer number (41569740).

Almost surely, 2^166240523 is an apocalyptic number.

166240523 is a deficient number, since it is larger than the sum of its proper divisors (38437).

166240523 is an equidigital number, since it uses as much as digits as its factorization.

166240523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38436.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 166240523 is about 12893.4294506931. The cubic root of 166240523 is about 549.8517760355.

The spelling of 166240523 in words is "one hundred sixty-six million, two hundred forty thousand, five hundred twenty-three".