51615845427 has 4 divisors (see below), whose sum is σ = 68821127240. Its totient is φ = 34410563616.

The previous prime is 51615845423. The next prime is 51615845429. The reversal of 51615845427 is 72454851615.

It is a happy number.

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

It is not a de Polignac number, because 51615845427 - 2² = 51615845423 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51615845423) 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, 8602640902 + ... + 8602640907.

It is an arithmetic number, because the mean of its divisors is an integer number (17205281810).

Almost surely, 2^51615845427 is an apocalyptic number.

51615845427 is a deficient number, since it is larger than the sum of its proper divisors (17205281813).

51615845427 is a wasteful number, since it uses less digits than its factorization.

51615845427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17205281812.

The product of its digits is 1344000, while the sum is 48.

The spelling of 51615845427 in words is "fifty-one billion, six hundred fifteen million, eight hundred forty-five thousand, four hundred twenty-seven".