642684001481 has 2 divisors, whose sum is σ = 642684001482. Its totient is φ = 642684001480.

The previous prime is 642684001457. The next prime is 642684001501. The reversal of 642684001481 is 184100486246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 578603635600 + 64080365881 = 760660^2 + 253141^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642684001481 is a prime.

It is a super-2 number, since 2×642684001481² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (642684001451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321342000740 + 321342000741.

It is an arithmetic number, because the mean of its divisors is an integer number (321342000741).

Almost surely, 2^642684001481 is an apocalyptic number.

It is an amenable number.

642684001481 is a deficient number, since it is larger than the sum of its proper divisors (1).

642684001481 is an equidigital number, since it uses as much as digits as its factorization.

642684001481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 294912, while the sum is 44.

The spelling of 642684001481 in words is "six hundred forty-two billion, six hundred eighty-four million, one thousand, four hundred eighty-one".