216639262078 has 16 divisors (see below), whose sum is σ = 336201658560. Its totient is φ = 104572871200.

The previous prime is 216639262069. The next prime is 216639262079. The reversal of 216639262078 is 870262936612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216639262079) 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, 332283 + ... + 737353.

It is an arithmetic number, because the mean of its divisors is an integer number (21012603660).

Almost surely, 2^216639262078 is an apocalyptic number.

216639262078 is a deficient number, since it is larger than the sum of its proper divisors (119562396482).

216639262078 is a wasteful number, since it uses less digits than its factorization.

216639262078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414323.

The product of its (nonzero) digits is 2612736, while the sum is 52.

The spelling of 216639262078 in words is "two hundred sixteen billion, six hundred thirty-nine million, two hundred sixty-two thousand, seventy-eight".