25431366442642 has 8 divisors (see below), whose sum is σ = 38147361565500. Its totient is φ = 12715579254144.

The previous prime is 25431366442633. The next prime is 25431366442667. The reversal of 25431366442642 is 24624466313452.

It can be written as a sum of positive squares in 2 ways, for example, as 15768277123041 + 9663089319601 = 3970929^2 + 3108551^2 .

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

It is a super-2 number, since 2×25431366442642² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25431366442642.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51677467 + ... + 52167262.

Almost surely, 2^{25431366442642} is an apocalyptic number.

25431366442642 is a deficient number, since it is larger than the sum of its proper divisors (12715995122858).

25431366442642 is a wasteful number, since it uses less digits than its factorization.

25431366442642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103967180.

The product of its digits is 19906560, while the sum is 52.

The spelling of 25431366442642 in words is "twenty-five trillion, four hundred thirty-one billion, three hundred sixty-six million, four hundred forty-two thousand, six hundred forty-two".