1979666147 has 4 divisors (see below), whose sum is σ = 1979756376. Its totient is φ = 1979575920.

The previous prime is 1979666119. The next prime is 1979666149. The reversal of 1979666147 is 7416669791.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1979666147 - 2¹² = 1979662051 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1979666092 and 1979666101.

It is not an unprimeable number, because it can be changed into a prime (1979666149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11372 + ... + 63942.

It is an arithmetic number, because the mean of its divisors is an integer number (494939094).

Almost surely, 2^1979666147 is an apocalyptic number.

1979666147 is a deficient number, since it is larger than the sum of its proper divisors (90229).

1979666147 is an equidigital number, since it uses as much as digits as its factorization.

1979666147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90228.

The product of its digits is 3429216, while the sum is 56.

The square root of 1979666147 is about 44493.4393703162. The cubic root of 1979666147 is about 1255.6366556452.

The spelling of 1979666147 in words is "one billion, nine hundred seventy-nine million, six hundred sixty-six thousand, one hundred forty-seven".