1651256065651 has 4 divisors (see below), whose sum is σ = 1651974943032. Its totient is φ = 1650537188272.

The previous prime is 1651256065649. The next prime is 1651256065687. The reversal of 1651256065651 is 1565606521561.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1651256065651 - 2¹ = 1651256065649 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1651256065595 and 1651256065604.

It is not an unprimeable number, because it can be changed into a prime (1651256065751) 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 3 ways as a sum of consecutive naturals, for example, 359435245 + ... + 359439838.

It is an arithmetic number, because the mean of its divisors is an integer number (412993735758).

Almost surely, 2^{1651256065651} is an apocalyptic number.

1651256065651 is a deficient number, since it is larger than the sum of its proper divisors (718877381).

1651256065651 is an equidigital number, since it uses as much as digits as its factorization.

1651256065651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 718877380.

The product of its (nonzero) digits is 1620000, while the sum is 49.

The spelling of 1651256065651 in words is "one trillion, six hundred fifty-one billion, two hundred fifty-six million, sixty-five thousand, six hundred fifty-one".