1667058987 has 18 divisors (see below), whose sum is σ = 2444323476. Its totient is φ = 1009867320.

The previous prime is 1667058973. The next prime is 1667058989. The reversal of 1667058987 is 7898507661.

It is not a de Polignac number, because 1667058987 - 2¹⁵ = 1667026219 is a prime.

It is a super-2 number, since 2×1667058987² = 5558171332274932338, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1667058989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 776838 + ... + 778980.

Almost surely, 2^1667058987 is an apocalyptic number.

1667058987 is a deficient number, since it is larger than the sum of its proper divisors (777264489).

1667058987 is an frugal number, since it uses more digits than its factorization.

1667058987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4311 (or 2157 counting only the distinct ones).

The product of its (nonzero) digits is 5080320, while the sum is 57.

The square root of 1667058987 is about 40829.6336868211. The cubic root of 1667058987 is about 1185.7241236360.

It can be divided in two parts, 16670 and 58987, that added together give a palindrome (75657).

The spelling of 1667058987 in words is "one billion, six hundred sixty-seven million, fifty-eight thousand, nine hundred eighty-seven".