1555655747 has 2 divisors, whose sum is σ = 1555655748. Its totient is φ = 1555655746.

The previous prime is 1555655711. The next prime is 1555655749. The reversal of 1555655747 is 7475565551.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1555655747 - 2¹² = 1555651651 is a prime.

Together with 1555655749, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1555655695 and 1555655704.

It is not a weakly prime, because it can be changed into another prime (1555655749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 777827873 + 777827874.

It is an arithmetic number, because the mean of its divisors is an integer number (777827874).

Almost surely, 2^1555655747 is an apocalyptic number.

1555655747 is a deficient number, since it is larger than the sum of its proper divisors (1).

1555655747 is an equidigital number, since it uses as much as digits as its factorization.

1555655747 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3675000, while the sum is 50.

The square root of 1555655747 is about 39441.8020252625. The cubic root of 1555655747 is about 1158.7004240565.

The spelling of 1555655747 in words is "one billion, five hundred fifty-five million, six hundred fifty-five thousand, seven hundred forty-seven".