1974542192647 has 2 divisors, whose sum is σ = 1974542192648. Its totient is φ = 1974542192646.

The previous prime is 1974542192641. The next prime is 1974542192683. The reversal of 1974542192647 is 7462912454791.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1974542192647 - 2²³ = 1974533804039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1974542192641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 987271096323 + 987271096324.

It is an arithmetic number, because the mean of its divisors is an integer number (987271096324).

Almost surely, 2^{1974542192647} is an apocalyptic number.

1974542192647 is a deficient number, since it is larger than the sum of its proper divisors (1).

1974542192647 is an equidigital number, since it uses as much as digits as its factorization.

1974542192647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30481920, while the sum is 61.

The spelling of 1974542192647 in words is "one trillion, nine hundred seventy-four billion, five hundred forty-two million, one hundred ninety-two thousand, six hundred forty-seven".