61115500051 has 4 divisors (see below), whose sum is σ = 61116259752. Its totient is φ = 61114740352.

The previous prime is 61115500037. The next prime is 61115500087. The reversal of 61115500051 is 15000551116.

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 61115500051 - 2⁹ = 61115499539 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61115499989 and 61115500025.

It is not an unprimeable number, because it can be changed into a prime (61115500091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 242665 + ... + 425578.

It is an arithmetic number, because the mean of its divisors is an integer number (15279064938).

Almost surely, 2^61115500051 is an apocalyptic number.

61115500051 is a deficient number, since it is larger than the sum of its proper divisors (759701).

61115500051 is an equidigital number, since it uses as much as digits as its factorization.

61115500051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 759700.

The product of its (nonzero) digits is 750, while the sum is 25.

The spelling of 61115500051 in words is "sixty-one billion, one hundred fifteen million, five hundred thousand, fifty-one".