1667602987 has 4 divisors (see below), whose sum is σ = 1712673376. Its totient is φ = 1622532600.

The previous prime is 1667602973. The next prime is 1667602991. The reversal of 1667602987 is 7892067661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7892067661 = 53 ⋅148906937.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1667602987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1667605987) 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, 22535139 + ... + 22535212.

It is an arithmetic number, because the mean of its divisors is an integer number (428168344).

Almost surely, 2^1667602987 is an apocalyptic number.

1667602987 is a deficient number, since it is larger than the sum of its proper divisors (45070389).

1667602987 is an equidigital number, since it uses as much as digits as its factorization.

1667602987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45070388.

The product of its (nonzero) digits is 1524096, while the sum is 52.

The square root of 1667602987 is about 40836.2949715079. The cubic root of 1667602987 is about 1185.8530860338.

The spelling of 1667602987 in words is "one billion, six hundred sixty-seven million, six hundred two thousand, nine hundred eighty-seven".