615161807781 has 8 divisors (see below), whose sum is σ = 868463728704. Its totient is φ = 385983879360.

The previous prime is 615161807753. The next prime is 615161807789. The reversal of 615161807781 is 187708161516.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 615161807781 - 2⁹ = 615161807269 is a prime.

It is a super-2 number, since 2×615161807781² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (51), and also a Moran number because the ratio is a prime number: 12061996231 = 615161807781 / (6 + 1 + 5 + 1 + 6 + 1 + 8 + 0 + 7 + 7 + 8 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (615161807789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6030998065 + ... + 6030998166.

It is an arithmetic number, because the mean of its divisors is an integer number (108557966088).

Almost surely, 2^615161807781 is an apocalyptic number.

It is an amenable number.

615161807781 is a deficient number, since it is larger than the sum of its proper divisors (253301920923).

615161807781 is a wasteful number, since it uses less digits than its factorization.

615161807781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12061996251.

The product of its (nonzero) digits is 564480, while the sum is 51.

The spelling of 615161807781 in words is "six hundred fifteen billion, one hundred sixty-one million, eight hundred seven thousand, seven hundred eighty-one".