215151540405 has 32 divisors (see below), whose sum is σ = 364550523264. Its totient is φ = 107980302336.

The previous prime is 215151540391. The next prime is 215151540433. The reversal of 215151540405 is 504045151512.

It is a happy number.

It is not a de Polignac number, because 215151540405 - 2²¹ = 215149443253 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1605049 + ... + 1733921.

It is an arithmetic number, because the mean of its divisors is an integer number (11392203852).

Almost surely, 2^215151540405 is an apocalyptic number.

It is an amenable number.

215151540405 is a deficient number, since it is larger than the sum of its proper divisors (149398982859).

215151540405 is a wasteful number, since it uses less digits than its factorization.

215151540405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135445.

The product of its (nonzero) digits is 20000, while the sum is 33.

Adding to 215151540405 its reverse (504045151512), we get a palindrome (719196691917).

The spelling of 215151540405 in words is "two hundred fifteen billion, one hundred fifty-one million, five hundred forty thousand, four hundred five".