201662426523 has 4 divisors (see below), whose sum is σ = 268883235368. Its totient is φ = 134441617680.

The previous prime is 201662426513. The next prime is 201662426531. The reversal of 201662426523 is 325624266102.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 201662426523 - 2¹⁷ = 201662295451 is a prime.

It is a super-2 number, since 2×201662426523² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201662426513) 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, 33610404418 + ... + 33610404423.

It is an arithmetic number, because the mean of its divisors is an integer number (67220808842).

Almost surely, 2^201662426523 is an apocalyptic number.

201662426523 is a deficient number, since it is larger than the sum of its proper divisors (67220808845).

201662426523 is an equidigital number, since it uses as much as digits as its factorization.

201662426523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67220808844.

The product of its (nonzero) digits is 207360, while the sum is 39.

The spelling of 201662426523 in words is "two hundred one billion, six hundred sixty-two million, four hundred twenty-six thousand, five hundred twenty-three".