1667505540 has 48 divisors (see below), whose sum is σ = 4672200960. Its totient is φ = 444364800.

The previous prime is 1667505517. The next prime is 1667505559. The reversal of 1667505540 is 455057661.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87381 + ... + 104739.

It is an arithmetic number, because the mean of its divisors is an integer number (97337520).

Almost surely, 2^1667505540 is an apocalyptic number.

1667505540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1667505540 is an abundant number, since it is smaller than the sum of its proper divisors (3004695420).

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

1667505540 is a wasteful number, since it uses less digits than its factorization.

1667505540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18972 (or 18970 counting only the distinct ones).

The product of its (nonzero) digits is 126000, while the sum is 39.

The square root of 1667505540 is about 40835.1018120440. The cubic root of 1667505540 is about 1185.8299869953.

The spelling of 1667505540 in words is "one billion, six hundred sixty-seven million, five hundred five thousand, five hundred forty".