642452151541 has 2 divisors, whose sum is σ = 642452151542. Its totient is φ = 642452151540.

The previous prime is 642452151479. The next prime is 642452151569. The reversal of 642452151541 is 145151254246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 594986993316 + 47465158225 = 771354^2 + 217865^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642452151541 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 642452151494 and 642452151503.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642452151571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321226075770 + 321226075771.

It is an arithmetic number, because the mean of its divisors is an integer number (321226075771).

Almost surely, 2^642452151541 is an apocalyptic number.

It is an amenable number.

642452151541 is a deficient number, since it is larger than the sum of its proper divisors (1).

642452151541 is an equidigital number, since it uses as much as digits as its factorization.

642452151541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 192000, while the sum is 40.

The spelling of 642452151541 in words is "six hundred forty-two billion, four hundred fifty-two million, one hundred fifty-one thousand, five hundred forty-one".