1978116085 has 16 divisors (see below), whose sum is σ = 2638396800. Its totient is φ = 1411483840.

The previous prime is 1978116083. The next prime is 1978116097. The reversal of 1978116085 is 5806118791.

It is not a de Polignac number, because 1978116085 - 2¹ = 1978116083 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978116083) 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, 336385 + ... + 342214.

It is an arithmetic number, because the mean of its divisors is an integer number (164899800).

Almost surely, 2^1978116085 is an apocalyptic number.

It is an amenable number.

1978116085 is a deficient number, since it is larger than the sum of its proper divisors (660280715).

1978116085 is a wasteful number, since it uses less digits than its factorization.

1978116085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678668.

The product of its (nonzero) digits is 120960, while the sum is 46.

The square root of 1978116085 is about 44476.0169642022. The cubic root of 1978116085 is about 1255.3088524157.

The spelling of 1978116085 in words is "one billion, nine hundred seventy-eight million, one hundred sixteen thousand, eighty-five".