51132611661 has 8 divisors (see below), whose sum is σ = 68802291360. Its totient is φ = 33775669872.

The previous prime is 51132611657. The next prime is 51132611681. The reversal of 51132611661 is 16611623115.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51132611661 - 2² = 51132611657 is a prime.

It is a super-2 number, since 2×51132611661² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51132611641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78184095 + ... + 78184748.

It is an arithmetic number, because the mean of its divisors is an integer number (8600286420).

Almost surely, 2^51132611661 is an apocalyptic number.

It is an amenable number.

51132611661 is a deficient number, since it is larger than the sum of its proper divisors (17669679699).

51132611661 is a wasteful number, since it uses less digits than its factorization.

51132611661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156368955.

The product of its digits is 6480, while the sum is 33.

The spelling of 51132611661 in words is "fifty-one billion, one hundred thirty-two million, six hundred eleven thousand, six hundred sixty-one".