1551006555547 has 2 divisors, whose sum is σ = 1551006555548. Its totient is φ = 1551006555546.

The previous prime is 1551006555521. The next prime is 1551006555599. The reversal of 1551006555547 is 7455556001551.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1551006555547 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1551006555547.

It is not a weakly prime, because it can be changed into another prime (1551006555347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 775503277773 + 775503277774.

It is an arithmetic number, because the mean of its divisors is an integer number (775503277774).

Almost surely, 2^{1551006555547} is an apocalyptic number.

1551006555547 is a deficient number, since it is larger than the sum of its proper divisors (1).

1551006555547 is an equidigital number, since it uses as much as digits as its factorization.

1551006555547 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2625000, while the sum is 49.

The spelling of 1551006555547 in words is "one trillion, five hundred fifty-one billion, six million, five hundred fifty-five thousand, five hundred forty-seven".