1081555667 has 8 divisors (see below), whose sum is σ = 1119417600. Its totient is φ = 1043731584.

The previous prime is 1081555633. The next prime is 1081555729. The reversal of 1081555667 is 7665551801.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1081555667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1081555067) 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, 56603 + ... + 73259.

It is an arithmetic number, because the mean of its divisors is an integer number (139927200).

Almost surely, 2^1081555667 is an apocalyptic number.

1081555667 is a deficient number, since it is larger than the sum of its proper divisors (37861933).

1081555667 is a wasteful number, since it uses less digits than its factorization.

1081555667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18925.

The product of its (nonzero) digits is 252000, while the sum is 44.

The square root of 1081555667 is about 32887.0136528083. The cubic root of 1081555667 is about 1026.4779526200.

The spelling of 1081555667 in words is "one billion, eighty-one million, five hundred fifty-five thousand, six hundred sixty-seven".