651067427721 has 4 divisors (see below), whose sum is σ = 868089903632. Its totient is φ = 434044951812.

The previous prime is 651067427693. The next prime is 651067427723. The reversal of 651067427721 is 127724760156.

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 not a de Polignac number, because 651067427721 - 2⁶ = 651067427657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (651067427723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108511237951 + ... + 108511237956.

It is an arithmetic number, because the mean of its divisors is an integer number (217022475908).

Almost surely, 2^651067427721 is an apocalyptic number.

It is an amenable number.

651067427721 is a deficient number, since it is larger than the sum of its proper divisors (217022475911).

651067427721 is a wasteful number, since it uses less digits than its factorization.

651067427721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217022475910.

The product of its (nonzero) digits is 987840, while the sum is 48.

The spelling of 651067427721 in words is "six hundred fifty-one billion, sixty-seven million, four hundred twenty-seven thousand, seven hundred twenty-one".