18946690547 has 2 divisors, whose sum is σ = 18946690548. Its totient is φ = 18946690546.

The previous prime is 18946690537. The next prime is 18946690561. The reversal of 18946690547 is 74509664981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18946690547 - 2¹⁶ = 18946625011 is a prime.

It is not a weakly prime, because it can be changed into another prime (18946690517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9473345273 + 9473345274.

It is an arithmetic number, because the mean of its divisors is an integer number (9473345274).

Almost surely, 2^18946690547 is an apocalyptic number.

18946690547 is a deficient number, since it is larger than the sum of its proper divisors (1).

18946690547 is an equidigital number, since it uses as much as digits as its factorization.

18946690547 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13063680, while the sum is 59.

The spelling of 18946690547 in words is "eighteen billion, nine hundred forty-six million, six hundred ninety thousand, five hundred forty-seven".