61651500051 has 4 divisors (see below), whose sum is σ = 82202000072. Its totient is φ = 41101000032.

The previous prime is 61651500017. The next prime is 61651500091. The reversal of 61651500051 is 15000515616.

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

It is not a de Polignac number, because 61651500051 - 2¹⁰ = 61651499027 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61651499991 and 61651500018.

It is not an unprimeable number, because it can be changed into a prime (61651500011) 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, 10275250006 + ... + 10275250011.

It is an arithmetic number, because the mean of its divisors is an integer number (20550500018).

Almost surely, 2^61651500051 is an apocalyptic number.

61651500051 is a deficient number, since it is larger than the sum of its proper divisors (20550500021).

61651500051 is a wasteful number, since it uses less digits than its factorization.

61651500051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20550500020.

The product of its (nonzero) digits is 4500, while the sum is 30.

The spelling of 61651500051 in words is "sixty-one billion, six hundred fifty-one million, five hundred thousand, fifty-one".