215404553450 has 48 divisors (see below), whose sum is σ = 406616474880. Its totient is φ = 84881160000.

The previous prime is 215404553401. The next prime is 215404553489. The reversal of 215404553450 is 54355404512.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4595231 + ... + 4641869.

It is an arithmetic number, because the mean of its divisors is an integer number (8471176560).

Almost surely, 2^215404553450 is an apocalyptic number.

215404553450 is a deficient number, since it is larger than the sum of its proper divisors (191211921430).

215404553450 is a wasteful number, since it uses less digits than its factorization.

215404553450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48023 (or 48018 counting only the distinct ones).

The product of its (nonzero) digits is 240000, while the sum is 38.

Adding to 215404553450 its reverse (54355404512), we get a palindrome (269759957962).

The spelling of 215404553450 in words is "two hundred fifteen billion, four hundred four million, five hundred fifty-three thousand, four hundred fifty".