15642421063 has 2 divisors, whose sum is σ = 15642421064. Its totient is φ = 15642421062.

The previous prime is 15642421031. The next prime is 15642421097. The reversal of 15642421063 is 36012424651.

It is an a-pointer prime, because the next prime (15642421097) can be obtained adding 15642421063 to its sum of digits (34).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 15642421063 - 2⁵ = 15642421031 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15642421013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7821210531 + 7821210532.

It is an arithmetic number, because the mean of its divisors is an integer number (7821210532).

Almost surely, 2^15642421063 is an apocalyptic number.

15642421063 is a deficient number, since it is larger than the sum of its proper divisors (1).

15642421063 is an equidigital number, since it uses as much as digits as its factorization.

15642421063 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 34.

The spelling of 15642421063 in words is "fifteen billion, six hundred forty-two million, four hundred twenty-one thousand, sixty-three".