1660171755 has 16 divisors (see below), whose sum is σ = 2897754624. Its totient is φ = 804931680.

The previous prime is 1660171753. The next prime is 1660171757. The reversal of 1660171755 is 5571710661.

It is an interprime number because it is at equal distance from previous prime (1660171753) and next prime (1660171757).

It is not a de Polignac number, because 1660171755 - 2¹ = 1660171753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1660171753) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5030659 + ... + 5030988.

It is an arithmetic number, because the mean of its divisors is an integer number (181109664).

Almost surely, 2^1660171755 is an apocalyptic number.

1660171755 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1660171755 is a deficient number, since it is larger than the sum of its proper divisors (1237582869).

1660171755 is a wasteful number, since it uses less digits than its factorization.

1660171755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10061666.

The product of its (nonzero) digits is 44100, while the sum is 39.

The square root of 1660171755 is about 40745.2053007467. The cubic root of 1660171755 is about 1184.0889827188.

The spelling of 1660171755 in words is "one billion, six hundred sixty million, one hundred seventy-one thousand, seven hundred fifty-five".