1545655402649 has 2 divisors, whose sum is σ = 1545655402650. Its totient is φ = 1545655402648.

The previous prime is 1545655402639. The next prime is 1545655402673. The reversal of 1545655402649 is 9462045565451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1506923194624 + 38732208025 = 1227568^2 + 196805^2 .

It is a cyclic number.

It is not a de Polignac number, because 1545655402649 - 2⁸ = 1545655402393 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1545655402594 and 1545655402603.

It is not a weakly prime, because it can be changed into another prime (1545655402639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 772827701324 + 772827701325.

It is an arithmetic number, because the mean of its divisors is an integer number (772827701325).

Almost surely, 2^{1545655402649} is an apocalyptic number.

It is an amenable number.

1545655402649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1545655402649 is an equidigital number, since it uses as much as digits as its factorization.

1545655402649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920000, while the sum is 56.

The spelling of 1545655402649 in words is "one trillion, five hundred forty-five billion, six hundred fifty-five million, four hundred two thousand, six hundred forty-nine".