1651722062561 has 2 divisors, whose sum is σ = 1651722062562. Its totient is φ = 1651722062560.

The previous prime is 1651722062519. The next prime is 1651722062569. The reversal of 1651722062561 is 1652602271561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1545250372561 + 106471690000 = 1243081^2 + 326300^2 .

It is a cyclic number.

It is not a de Polignac number, because 1651722062561 - 2³⁴ = 1634542193377 is a prime.

It is not a weakly prime, because it can be changed into another prime (1651722062569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 825861031280 + 825861031281.

It is an arithmetic number, because the mean of its divisors is an integer number (825861031281).

Almost surely, 2^{1651722062561} is an apocalyptic number.

It is an amenable number.

1651722062561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1651722062561 is an equidigital number, since it uses as much as digits as its factorization.

1651722062561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 302400, while the sum is 44.

The spelling of 1651722062561 in words is "one trillion, six hundred fifty-one billion, seven hundred twenty-two million, sixty-two thousand, five hundred sixty-one".