642416191757 has 4 divisors (see below), whose sum is σ = 644686213920. Its totient is φ = 640146169596.

The previous prime is 642416191751. The next prime is 642416191777. The reversal of 642416191757 is 757191614246.

642416191757 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 757191614246 = 2 ⋅378595807123.

It is a cyclic number.

It is not a de Polignac number, because 642416191757 - 2¹⁸ = 642415929613 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 642416191699 and 642416191708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642416191751) 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, 1135010657 + ... + 1135011222.

It is an arithmetic number, because the mean of its divisors is an integer number (161171553480).

Almost surely, 2^642416191757 is an apocalyptic number.

It is an amenable number.

642416191757 is a deficient number, since it is larger than the sum of its proper divisors (2270022163).

642416191757 is a wasteful number, since it uses less digits than its factorization.

642416191757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2270022162.

The product of its digits is 2540160, while the sum is 53.

The spelling of 642416191757 in words is "six hundred forty-two billion, four hundred sixteen million, one hundred ninety-one thousand, seven hundred fifty-seven".