1557042655 has 16 divisors (see below), whose sum is σ = 2154968640. Its totient is φ = 1057888512.

The previous prime is 1557042589. The next prime is 1557042671. The reversal of 1557042655 is 5562407551.

It is a cyclic number.

It is not a de Polignac number, because 1557042655 - 2⁹ = 1557042143 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 200254 + ... + 207883.

It is an arithmetic number, because the mean of its divisors is an integer number (134685540).

Almost surely, 2^1557042655 is an apocalyptic number.

1557042655 is a deficient number, since it is larger than the sum of its proper divisors (597925985).

1557042655 is a wasteful number, since it uses less digits than its factorization.

1557042655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408258.

The product of its (nonzero) digits is 210000, while the sum is 40.

The square root of 1557042655 is about 39459.3798101288. The cubic root of 1557042655 is about 1159.0446590761.

The spelling of 1557042655 in words is "one billion, five hundred fifty-seven million, forty-two thousand, six hundred fifty-five".