215407864649 has 16 divisors (see below), whose sum is σ = 222330942720. Its totient is φ = 208592616960.

The previous prime is 215407864631. The next prime is 215407864681. The reversal of 215407864649 is 946468704512.

215407864649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 215407864649 - 2²⁰ = 215406816073 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 215407864594 and 215407864603.

It is not an unprimeable number, because it can be changed into a prime (215407864349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14064854 + ... + 14080160.

It is an arithmetic number, because the mean of its divisors is an integer number (13895683920).

Almost surely, 2^215407864649 is an apocalyptic number.

It is an amenable number.

215407864649 is a deficient number, since it is larger than the sum of its proper divisors (6923078071).

215407864649 is a wasteful number, since it uses less digits than its factorization.

215407864649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18800.

The product of its (nonzero) digits is 11612160, while the sum is 56.

The spelling of 215407864649 in words is "two hundred fifteen billion, four hundred seven million, eight hundred sixty-four thousand, six hundred forty-nine".