63691949399027 has 2 divisors, whose sum is σ = 63691949399028. Its totient is φ = 63691949399026.

The previous prime is 63691949399021. The next prime is 63691949399053. The reversal of 63691949399027 is 72099394919636.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 63691949399027 - 2²⁰ = 63691948350451 is a prime.

It is not a weakly prime, because it can be changed into another prime (63691949399021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31845974699513 + 31845974699514.

It is an arithmetic number, because the mean of its divisors is an integer number (31845974699514).

Almost surely, 2^{63691949399027} is an apocalyptic number.

63691949399027 is a deficient number, since it is larger than the sum of its proper divisors (1).

63691949399027 is an equidigital number, since it uses as much as digits as its factorization.

63691949399027 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1071385056, while the sum is 77.

The spelling of 63691949399027 in words is "sixty-three trillion, six hundred ninety-one billion, nine hundred forty-nine million, three hundred ninety-nine thousand, twenty-seven".