51609119661 has 24 divisors (see below), whose sum is σ = 82237222080. Its totient is φ = 30926808000.

The previous prime is 51609119657. The next prime is 51609119663. The reversal of 51609119661 is 16691190615.

It is not a de Polignac number, because 51609119661 - 2² = 51609119657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51609119663) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2919865 + ... + 2937486.

It is an arithmetic number, because the mean of its divisors is an integer number (3426550920).

Almost surely, 2^51609119661 is an apocalyptic number.

It is an amenable number.

51609119661 is a deficient number, since it is larger than the sum of its proper divisors (30628102419).

51609119661 is a wasteful number, since it uses less digits than its factorization.

51609119661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5857457 (or 5857454 counting only the distinct ones).

The product of its (nonzero) digits is 87480, while the sum is 45.

The spelling of 51609119661 in words is "fifty-one billion, six hundred nine million, one hundred nineteen thousand, six hundred sixty-one".