13948403561 has 2 divisors, whose sum is σ = 13948403562. Its totient is φ = 13948403560.

The previous prime is 13948403551. The next prime is 13948403653. The reversal of 13948403561 is 16530484931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11619762025 + 2328641536 = 107795^2 + 48256^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13948403561 is a prime.

It is not a weakly prime, because it can be changed into another prime (13948403551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6974201780 + 6974201781.

It is an arithmetic number, because the mean of its divisors is an integer number (6974201781).

Almost surely, 2^13948403561 is an apocalyptic number.

It is an amenable number.

13948403561 is a deficient number, since it is larger than the sum of its proper divisors (1).

13948403561 is an equidigital number, since it uses as much as digits as its factorization.

13948403561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 311040, while the sum is 44.

The spelling of 13948403561 in words is "thirteen billion, nine hundred forty-eight million, four hundred three thousand, five hundred sixty-one".