51434515661 has 16 divisors (see below), whose sum is σ = 52928061120. Its totient is φ = 49955256960.

The previous prime is 51434515637. The next prime is 51434515679. The reversal of 51434515661 is 16651543415.

It is a cyclic number.

It is not a de Polignac number, because 51434515661 - 2³⁴ = 34254646477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51434515361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6146066 + ... + 6154428.

It is an arithmetic number, because the mean of its divisors is an integer number (3308003820).

Almost surely, 2^51434515661 is an apocalyptic number.

It is an amenable number.

51434515661 is a deficient number, since it is larger than the sum of its proper divisors (1493545459).

51434515661 is a wasteful number, since it uses less digits than its factorization.

51434515661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9196.

The product of its digits is 216000, while the sum is 41.

The spelling of 51434515661 in words is "fifty-one billion, four hundred thirty-four million, five hundred fifteen thousand, six hundred sixty-one".