216890970836 has 12 divisors (see below), whose sum is σ = 379564663380. Its totient is φ = 108443924160.

The previous prime is 216890970787. The next prime is 216890970871. The reversal of 216890970836 is 638079098612.

It can be written as a sum of positive squares in 2 ways, for example, as 155713895236 + 61177075600 = 394606^2 + 247340^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43505 + ... + 660056.

It is an arithmetic number, because the mean of its divisors is an integer number (31630388615).

Almost surely, 2^216890970836 is an apocalyptic number.

It is an amenable number.

216890970836 is a deficient number, since it is larger than the sum of its proper divisors (162673692544).

216890970836 is a wasteful number, since it uses less digits than its factorization.

216890970836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780634 (or 780632 counting only the distinct ones).

The product of its (nonzero) digits is 7838208, while the sum is 59.

The spelling of 216890970836 in words is "two hundred sixteen billion, eight hundred ninety million, nine hundred seventy thousand, eight hundred thirty-six".