1551761064649 has 2 divisors, whose sum is σ = 1551761064650. Its totient is φ = 1551761064648.

The previous prime is 1551761064613. The next prime is 1551761064673. The reversal of 1551761064649 is 9464601671551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1034034765625 + 517726299024 = 1016875^2 + 719532^2 .

It is a cyclic number.

It is not a de Polignac number, because 1551761064649 - 2⁹ = 1551761064137 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1551761064649.

It is not a weakly prime, because it can be changed into another prime (1551761061649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 775880532324 + 775880532325.

It is an arithmetic number, because the mean of its divisors is an integer number (775880532325).

Almost surely, 2^{1551761064649} is an apocalyptic number.

It is an amenable number.

1551761064649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1551761064649 is an equidigital number, since it uses as much as digits as its factorization.

1551761064649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5443200, while the sum is 55.

The spelling of 1551761064649 in words is "one trillion, five hundred fifty-one billion, seven hundred sixty-one million, sixty-four thousand, six hundred forty-nine".