615506220051 has 4 divisors (see below), whose sum is σ = 820674960072. Its totient is φ = 410337480032.

The previous prime is 615506220019. The next prime is 615506220059. The reversal of 615506220051 is 150022605516.

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

It is a cyclic number.

It is not a de Polignac number, because 615506220051 - 2⁵ = 615506220019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 615506219994 and 615506220021.

It is not an unprimeable number, because it can be changed into a prime (615506220059) 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 3 ways as a sum of consecutive naturals, for example, 102584370006 + ... + 102584370011.

It is an arithmetic number, because the mean of its divisors is an integer number (205168740018).

Almost surely, 2^615506220051 is an apocalyptic number.

615506220051 is a deficient number, since it is larger than the sum of its proper divisors (205168740021).

615506220051 is a wasteful number, since it uses less digits than its factorization.

615506220051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205168740020.

The product of its (nonzero) digits is 18000, while the sum is 33.

Adding to 615506220051 its reverse (150022605516), we get a palindrome (765528825567).

The spelling of 615506220051 in words is "six hundred fifteen billion, five hundred six million, two hundred twenty thousand, fifty-one".