1658342985 has 32 divisors (see below), whose sum is σ = 2949639168. Its totient is φ = 790076160.

The previous prime is 1658342909. The next prime is 1658342999. The reversal of 1658342985 is 5892438561.

It is not a de Polignac number, because 1658342985 - 2⁸ = 1658342729 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 131122 + ... + 143211.

It is an arithmetic number, because the mean of its divisors is an integer number (92176224).

Almost surely, 2^1658342985 is an apocalyptic number.

1658342985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1658342985 is a deficient number, since it is larger than the sum of its proper divisors (1291296183).

1658342985 is a wasteful number, since it uses less digits than its factorization.

1658342985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274385.

The product of its digits is 2073600, while the sum is 51.

The square root of 1658342985 is about 40722.7575809890. The cubic root of 1658342985 is about 1183.6540433817.

The spelling of 1658342985 in words is "one billion, six hundred fifty-eight million, three hundred forty-two thousand, nine hundred eighty-five".