1978855611 has 8 divisors (see below), whose sum is σ = 2702827344. Its totient is φ = 1287060480.

The previous prime is 1978855609. The next prime is 1978855621. The reversal of 1978855611 is 1165588791.

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

It is not a de Polignac number, because 1978855611 - 2¹ = 1978855609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1978855601) 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, 8044006 + ... + 8044251.

It is an arithmetic number, because the mean of its divisors is an integer number (337853418).

Almost surely, 2^1978855611 is an apocalyptic number.

1978855611 is a deficient number, since it is larger than the sum of its proper divisors (723971733).

1978855611 is a wasteful number, since it uses less digits than its factorization.

1978855611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16088301.

The product of its digits is 604800, while the sum is 51.

The square root of 1978855611 is about 44484.3299488708. The cubic root of 1978855611 is about 1255.4652668746.

The spelling of 1978855611 in words is "one billion, nine hundred seventy-eight million, eight hundred fifty-five thousand, six hundred eleven".