1555656001 has 2 divisors, whose sum is σ = 1555656002. Its totient is φ = 1555656000.

The previous prime is 1555655939. The next prime is 1555656023. The reversal of 1555656001 is 1006565551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1554251776 + 1404225 = 39424^2 + 1185^2 .

It is a cyclic number.

It is not a de Polignac number, because 1555656001 - 2¹³ = 1555647809 is a prime.

It is not a weakly prime, because it can be changed into another prime (1555656101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 777828000 + 777828001.

It is an arithmetic number, because the mean of its divisors is an integer number (777828001).

Almost surely, 2^1555656001 is an apocalyptic number.

It is an amenable number.

1555656001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1555656001 is an equidigital number, since it uses as much as digits as its factorization.

1555656001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22500, while the sum is 34.

The square root of 1555656001 is about 39441.8052451964. The cubic root of 1555656001 is about 1158.7004871188.

The spelling of 1555656001 in words is "one billion, five hundred fifty-five million, six hundred fifty-six thousand, one".