63642790957 has 2 divisors, whose sum is σ = 63642790958. Its totient is φ = 63642790956.

The previous prime is 63642790933. The next prime is 63642790993. The reversal of 63642790957 is 75909724636.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57347796676 + 6294994281 = 239474^2 + 79341^2 .

It is a cyclic number.

It is not a de Polignac number, because 63642790957 - 2¹⁹ = 63642266669 is a prime.

It is a super-3 number, since 3×63642790957³ (a number of 33 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63642790997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31821395478 + 31821395479.

It is an arithmetic number, because the mean of its divisors is an integer number (31821395479).

Almost surely, 2^63642790957 is an apocalyptic number.

It is an amenable number.

63642790957 is a deficient number, since it is larger than the sum of its proper divisors (1).

63642790957 is an equidigital number, since it uses as much as digits as its factorization.

63642790957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17146080, while the sum is 58.

The spelling of 63642790957 in words is "sixty-three billion, six hundred forty-two million, seven hundred ninety thousand, nine hundred fifty-seven".