1972666667 has 6 divisors (see below), whose sum is σ = 2019611412. Its totient is φ = 1926788892.

The previous prime is 1972666643. The next prime is 1972666673. The reversal of 1972666667 is 7666662791.

It is not a de Polignac number, because 1972666667 - 2²⁴ = 1955889451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1972666607) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 531593 + ... + 535290.

It is an arithmetic number, because the mean of its divisors is an integer number (336601902).

Almost surely, 2^1972666667 is an apocalyptic number.

1972666667 is a deficient number, since it is larger than the sum of its proper divisors (46944745).

1972666667 is an equidigital number, since it uses as much as digits as its factorization.

1972666667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1066969 (or 1066926 counting only the distinct ones).

The product of its digits is 6858432, while the sum is 56.

The square root of 1972666667 is about 44414.7122809548. The cubic root of 1972666667 is about 1254.1550620241.

The spelling of 1972666667 in words is "one billion, nine hundred seventy-two million, six hundred sixty-six thousand, six hundred sixty-seven".