1642605523 has 4 divisors (see below), whose sum is σ = 1768959808. Its totient is φ = 1516251240.

The previous prime is 1642605479. The next prime is 1642605551. The reversal of 1642605523 is 3255062461.

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

It is a cyclic number.

It is not a de Polignac number, because 1642605523 - 2¹⁷ = 1642474451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1642605553) 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, 63177123 + ... + 63177148.

It is an arithmetic number, because the mean of its divisors is an integer number (442239952).

Almost surely, 2^1642605523 is an apocalyptic number.

1642605523 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1642605523 is a deficient number, since it is larger than the sum of its proper divisors (126354285).

1642605523 is a wasteful number, since it uses less digits than its factorization.

1642605523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126354284.

The product of its (nonzero) digits is 43200, while the sum is 34.

The square root of 1642605523 is about 40529.0700978939. The cubic root of 1642605523 is about 1179.8978947848.

Adding to 1642605523 its reverse (3255062461), we get a palindrome (4897667984).

The spelling of 1642605523 in words is "one billion, six hundred forty-two million, six hundred five thousand, five hundred twenty-three".