642623323465 has 8 divisors (see below), whose sum is σ = 771357960648. Its totient is φ = 513958677120.

The previous prime is 642623323453. The next prime is 642623323481. The reversal of 642623323465 is 564323326246.

It can be written as a sum of positive squares in 4 ways, for example, as 3365508169 + 639257815296 = 58013^2 + 799536^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-642623323465 is a prime.

It is a super-2 number, since 2×642623323465² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17477506 + ... + 17514235.

It is an arithmetic number, because the mean of its divisors is an integer number (96419745081).

Almost surely, 2^642623323465 is an apocalyptic number.

It is an amenable number.

642623323465 is a deficient number, since it is larger than the sum of its proper divisors (128734637183).

642623323465 is a wasteful number, since it uses less digits than its factorization.

642623323465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34995419.

The product of its digits is 3732480, while the sum is 46.

The spelling of 642623323465 in words is "six hundred forty-two billion, six hundred twenty-three million, three hundred twenty-three thousand, four hundred sixty-five".