1555401325477 has 2 divisors, whose sum is σ = 1555401325478. Its totient is φ = 1555401325476.

The previous prime is 1555401325469. The next prime is 1555401325571. The reversal of 1555401325477 is 7745231045551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1520027615236 + 35373710241 = 1232894^2 + 188079^2 .

It is a cyclic number.

It is not a de Polignac number, because 1555401325477 - 2³ = 1555401325469 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1555401325477.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1555401325447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 777700662738 + 777700662739.

It is an arithmetic number, because the mean of its divisors is an integer number (777700662739).

Almost surely, 2^{1555401325477} is an apocalyptic number.

It is an amenable number.

1555401325477 is a deficient number, since it is larger than the sum of its proper divisors (1).

1555401325477 is an equidigital number, since it uses as much as digits as its factorization.

1555401325477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2940000, while the sum is 49.

The spelling of 1555401325477 in words is "one trillion, five hundred fifty-five billion, four hundred one million, three hundred twenty-five thousand, four hundred seventy-seven".