216987250478 has 16 divisors (see below), whose sum is σ = 337264648560. Its totient is φ = 104578152000.

The previous prime is 216987250421. The next prime is 216987250499. The reversal of 216987250478 is 874052789612.

It is a super-2 number, since 2×216987250478² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3077588 + ... + 3147303.

It is an arithmetic number, because the mean of its divisors is an integer number (21079040535).

Almost surely, 2^216987250478 is an apocalyptic number.

216987250478 is a deficient number, since it is larger than the sum of its proper divisors (120277398082).

216987250478 is a wasteful number, since it uses less digits than its factorization.

216987250478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6225523.

The product of its (nonzero) digits is 13547520, while the sum is 59.

The spelling of 216987250478 in words is "two hundred sixteen billion, nine hundred eighty-seven million, two hundred fifty thousand, four hundred seventy-eight".