215655653400 has 192 divisors, whose sum is σ = 729572054400. Its totient is φ = 52261248000.

The previous prime is 215655653383. The next prime is 215655653461. The reversal of 215655653400 is 4356556512.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 29095695 + ... + 29103105.

It is an arithmetic number, because the mean of its divisors is an integer number (3799854450).

Almost surely, 2^215655653400 is an apocalyptic number.

215655653400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215655653400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (364786027200).

215655653400 is an abundant number, since it is smaller than the sum of its proper divisors (513916401000).

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

215655653400 is a wasteful number, since it uses less digits than its factorization.

215655653400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11850 (or 11841 counting only the distinct ones).

The product of its (nonzero) digits is 540000, while the sum is 42.

The spelling of 215655653400 in words is "two hundred fifteen billion, six hundred fifty-five million, six hundred fifty-three thousand, four hundred".