662986971 has 8 divisors (see below), whose sum is σ = 982202960. Its totient is φ = 441991296.

The previous prime is 662986963. The next prime is 662986981. The reversal of 662986971 is 179689266.

662986971 is a `hidden beast` number, since 6 + 629 + 8 + 6 + 9 + 7 + 1 = 666.

It is not a de Polignac number, because 662986971 - 2³ = 662986963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (662986981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12277510 + ... + 12277563.

It is an arithmetic number, because the mean of its divisors is an integer number (122775370).

Almost surely, 2^662986971 is an apocalyptic number.

662986971 is a deficient number, since it is larger than the sum of its proper divisors (319215989).

662986971 is a wasteful number, since it uses less digits than its factorization.

662986971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24555082 (or 24555076 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 54.

The square root of 662986971 is about 25748.5333757090. The cubic root of 662986971 is about 871.9702434049.

The spelling of 662986971 in words is "six hundred sixty-two million, nine hundred eighty-six thousand, nine hundred seventy-one".