662991012 has 36 divisors (see below), whose sum is σ = 1721191836. Its totient is φ = 215023680.

The previous prime is 662990957. The next prime is 662991013. The reversal of 662991012 is 210199266.

662991012 is a `hidden beast` number, since 6 + 629 + 9 + 10 + 12 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 519566436 + 143424576 = 22794^2 + 11976^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (662991013) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 247539 + ... + 250202.

Almost surely, 2^662991012 is an apocalyptic number.

It is an amenable number.

662991012 is an abundant number, since it is smaller than the sum of its proper divisors (1058200824).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

662991012 is a wasteful number, since it uses less digits than its factorization.

662991012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497788 (or 497783 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 662991012 is about 25748.6118460782. The cubic root of 662991012 is about 871.9720149956.

The spelling of 662991012 in words is "six hundred sixty-two million, nine hundred ninety-one thousand, twelve".