947806421997 has 16 divisors (see below), whose sum is σ = 1338168444480. Its totient is φ = 594662606592.

The previous prime is 947806421983. The next prime is 947806421999. The reversal of 947806421997 is 799124608749.

It is a happy number.

It is not a de Polignac number, because 947806421997 - 2⁴ = 947806421981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (947806421999) 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 in 15 ways as a sum of consecutive naturals, for example, 169243 + ... + 1387175.

It is an arithmetic number, because the mean of its divisors is an integer number (83635527780).

Almost surely, 2^947806421997 is an apocalyptic number.

It is an amenable number.

947806421997 is a deficient number, since it is larger than the sum of its proper divisors (390362022483).

947806421997 is a wasteful number, since it uses less digits than its factorization.

947806421997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1233212.

The product of its (nonzero) digits is 54867456, while the sum is 66.

The spelling of 947806421997 in words is "nine hundred forty-seven billion, eight hundred six million, four hundred twenty-one thousand, nine hundred ninety-seven".