215706078451 has 16 divisors (see below), whose sum is σ = 223359968448. Its totient is φ = 208222963200.

The previous prime is 215706078397. The next prime is 215706078487. The reversal of 215706078451 is 154870607512.

215706078451 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 215706078451 - 2¹⁵ = 215706045683 is a prime.

It is a super-2 number, since 2×215706078451² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215706078491) 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, 558181 + ... + 861961.

It is an arithmetic number, because the mean of its divisors is an integer number (13959998028).

Almost surely, 2^215706078451 is an apocalyptic number.

215706078451 is a deficient number, since it is larger than the sum of its proper divisors (7653889997).

215706078451 is a wasteful number, since it uses less digits than its factorization.

215706078451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304062.

The product of its (nonzero) digits is 470400, while the sum is 46.

The spelling of 215706078451 in words is "two hundred fifteen billion, seven hundred six million, seventy-eight thousand, four hundred fifty-one".