215452061555 has 4 divisors (see below), whose sum is σ = 258542473872. Its totient is φ = 172361649240.

The previous prime is 215452061533. The next prime is 215452061639. The reversal of 215452061555 is 555160254512.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 215452061555 - 2⁶ = 215452061491 is a prime.

It is a Duffinian 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, 21545206151 + ... + 21545206160.

It is an arithmetic number, because the mean of its divisors is an integer number (64635618468).

Almost surely, 2^215452061555 is an apocalyptic number.

215452061555 is a deficient number, since it is larger than the sum of its proper divisors (43090412317).

215452061555 is an equidigital number, since it uses as much as digits as its factorization.

215452061555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43090412316.

The product of its (nonzero) digits is 300000, while the sum is 41.

The spelling of 215452061555 in words is "two hundred fifteen billion, four hundred fifty-two million, sixty-one thousand, five hundred fifty-five".