1660272905 has 16 divisors (see below), whose sum is σ = 2015477760. Its totient is φ = 1312863552.

The previous prime is 1660272893. The next prime is 1660272907. The reversal of 1660272905 is 5092720661.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1660272905 is a prime.

It is a super-2 number, since 2×1660272905² = 5513012238154278050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1660272907) 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, 171176 + ... + 180614.

It is an arithmetic number, because the mean of its divisors is an integer number (125967360).

Almost surely, 2^1660272905 is an apocalyptic number.

It is an amenable number.

1660272905 is a deficient number, since it is larger than the sum of its proper divisors (355204855).

1660272905 is a wasteful number, since it uses less digits than its factorization.

1660272905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9848.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 1660272905 is about 40746.4465321824. The cubic root of 1660272905 is about 1184.1130300637.

The spelling of 1660272905 in words is "one billion, six hundred sixty million, two hundred seventy-two thousand, nine hundred five".