642611125523 has 4 divisors (see below), whose sum is σ = 642619240848. Its totient is φ = 642603010200.

The previous prime is 642611125489. The next prime is 642611125547. The reversal of 642611125523 is 325521116246.

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 642611125523 - 2²⁰ = 642610076947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642611124523) 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, 3937703 + ... + 4097648.

It is an arithmetic number, because the mean of its divisors is an integer number (160654810212).

Almost surely, 2^642611125523 is an apocalyptic number.

642611125523 is a deficient number, since it is larger than the sum of its proper divisors (8115325).

642611125523 is an equidigital number, since it uses as much as digits as its factorization.

642611125523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8115324.

The product of its digits is 86400, while the sum is 38.

The spelling of 642611125523 in words is "six hundred forty-two billion, six hundred eleven million, one hundred twenty-five thousand, five hundred twenty-three".