642615375765 has 16 divisors (see below), whose sum is σ = 1121655928896. Its totient is φ = 311571091200.

The previous prime is 642615375761. The next prime is 642615375833. The reversal of 642615375765 is 567573516246.

It is not a de Polignac number, because 642615375765 - 2² = 642615375761 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642615375761) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1947319156 + ... + 1947319485.

It is an arithmetic number, because the mean of its divisors is an integer number (70103495556).

Almost surely, 2^642615375765 is an apocalyptic number.

It is an amenable number.

642615375765 is a deficient number, since it is larger than the sum of its proper divisors (479040553131).

642615375765 is a wasteful number, since it uses less digits than its factorization.

642615375765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3894638660.

The product of its digits is 31752000, while the sum is 57.

The spelling of 642615375765 in words is "six hundred forty-two billion, six hundred fifteen million, three hundred seventy-five thousand, seven hundred sixty-five".