65510421761 has 4 divisors (see below), whose sum is σ = 68358700992. Its totient is φ = 62662142532.

The previous prime is 65510421751. The next prime is 65510421797. The reversal of 65510421761 is 16712401556.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65510421761 is a prime.

It is a super-2 number, since 2×65510421761² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65510421731) 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, 1424139581 + ... + 1424139626.

It is an arithmetic number, because the mean of its divisors is an integer number (17089675248).

Almost surely, 2^65510421761 is an apocalyptic number.

It is an amenable number.

65510421761 is a deficient number, since it is larger than the sum of its proper divisors (2848279231).

65510421761 is a wasteful number, since it uses less digits than its factorization.

65510421761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2848279230.

The product of its (nonzero) digits is 50400, while the sum is 38.

The spelling of 65510421761 in words is "sixty-five billion, five hundred ten million, four hundred twenty-one thousand, seven hundred sixty-one".