51609684489 has 16 divisors (see below), whose sum is σ = 75207417024. Its totient is φ = 31220769600.

The previous prime is 51609684457. The next prime is 51609684493. The reversal of 51609684489 is 98448690615.

It is not a de Polignac number, because 51609684489 - 2⁵ = 51609684457 is a prime.

It is a super-2 number, since 2×51609684489² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51609684409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1427554 + ... + 1463259.

It is an arithmetic number, because the mean of its divisors is an integer number (4700463564).

Almost surely, 2^51609684489 is an apocalyptic number.

It is an amenable number.

51609684489 is a deficient number, since it is larger than the sum of its proper divisors (23597732535).

51609684489 is a wasteful number, since it uses less digits than its factorization.

51609684489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2891368.

The product of its (nonzero) digits is 14929920, while the sum is 60.

The spelling of 51609684489 in words is "fifty-one billion, six hundred nine million, six hundred eighty-four thousand, four hundred eighty-nine".