42519404194661 has 4 divisors (see below), whose sum is σ = 42519548269632. Its totient is φ = 42519260119692.

The previous prime is 42519404194643. The next prime is 42519404194679. The reversal of 42519404194661 is 16649140491524.

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.

It is an interprime number because it is at equal distance from previous prime (42519404194643) and next prime (42519404194679).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42519404194661 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42519404194597 and 42519404194606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42519004194661) 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, 71593895 + ... + 72185348.

It is an arithmetic number, because the mean of its divisors is an integer number (10629887067408).

Almost surely, 2^{42519404194661} is an apocalyptic number.

It is an amenable number.

42519404194661 is a deficient number, since it is larger than the sum of its proper divisors (144074971).

42519404194661 is a wasteful number, since it uses less digits than its factorization.

42519404194661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144074970.

The product of its (nonzero) digits is 7464960, while the sum is 56.

The spelling of 42519404194661 in words is "forty-two trillion, five hundred nineteen billion, four hundred four million, one hundred ninety-four thousand, six hundred sixty-one".