651583171081 has 4 divisors (see below), whose sum is σ = 652978424592. Its totient is φ = 650187917572.

The previous prime is 651583171027. The next prime is 651583171097. The reversal of 651583171081 is 180171385156.

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 not a de Polignac number, because 651583171081 - 2¹¹ = 651583169033 is a prime.

It is a super-2 number, since 2×651583171081² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (651583171781) 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, 697626055 + ... + 697626988.

It is an arithmetic number, because the mean of its divisors is an integer number (163244606148).

Almost surely, 2^651583171081 is an apocalyptic number.

It is an amenable number.

651583171081 is a deficient number, since it is larger than the sum of its proper divisors (1395253511).

651583171081 is a wasteful number, since it uses less digits than its factorization.

651583171081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1395253510.

The product of its (nonzero) digits is 201600, while the sum is 46.

The spelling of 651583171081 in words is "six hundred fifty-one billion, five hundred eighty-three million, one hundred seventy-one thousand, eighty-one".