216374556537720 has 384 divisors, whose sum is σ = 850820346316800. Its totient is φ = 48760462598400.

The previous prime is 216374556537703. The next prime is 216374556537731. The reversal of 216374556537720 is 27735655473612.

216374556537720 is a `hidden beast` number, since 2 + 1 + 6 + 3 + 7 + 4 + 556 + 5 + 3 + 7 + 72 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 25036416 + ... + 32551055.

It is an arithmetic number, because the mean of its divisors is an integer number (2215677985200).

Almost surely, 2^{216374556537720} is an apocalyptic number.

216374556537720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216374556537720 is an abundant number, since it is smaller than the sum of its proper divisors (634445789779080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216374556537720 is a wasteful number, since it uses less digits than its factorization.

216374556537720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57587576 (or 57587559 counting only the distinct ones).

The product of its (nonzero) digits is 222264000, while the sum is 63.

The spelling of 216374556537720 in words is "two hundred sixteen trillion, three hundred seventy-four billion, five hundred fifty-six million, five hundred thirty-seven thousand, seven hundred twenty".