1655085881 has 8 divisors (see below), whose sum is σ = 1752799464. Its totient is φ = 1557411840.

The previous prime is 1655085869. The next prime is 1655085893. The reversal of 1655085881 is 1885805561.

It is an interprime number because it is at equal distance from previous prime (1655085869) and next prime (1655085893).

It can be written as a sum of positive squares in 4 ways, for example, as 640090000 + 1014995881 = 25300^2 + 31859^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1655085881 - 2¹⁴ = 1655069497 is a prime.

It is a super-2 number, since 2×1655085881² = 5478618546971092322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1655085811) 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, 155201 + ... + 165521.

It is an arithmetic number, because the mean of its divisors is an integer number (219099933).

Almost surely, 2^1655085881 is an apocalyptic number.

It is an amenable number.

1655085881 is a deficient number, since it is larger than the sum of its proper divisors (97713583).

1655085881 is a wasteful number, since it uses less digits than its factorization.

1655085881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19771.

The product of its (nonzero) digits is 384000, while the sum is 47.

The square root of 1655085881 is about 40682.7467238878. The cubic root of 1655085881 is about 1182.8786084788.

The spelling of 1655085881 in words is "one billion, six hundred fifty-five million, eighty-five thousand, eight hundred eighty-one".