1555660494 has 12 divisors (see below), whose sum is σ = 3370597776. Its totient is φ = 518553492.

The previous prime is 1555660423. The next prime is 1555660541. The reversal of 1555660494 is 4940665551.

1555660494 is a `hidden beast` number, since 1 + 5 + 556 + 6 + 0 + 4 + 94 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 43212774 + ... + 43212809.

It is an arithmetic number, because the mean of its divisors is an integer number (280883148).

Almost surely, 2^1555660494 is an apocalyptic number.

1555660494 is an abundant number, since it is smaller than the sum of its proper divisors (1814937282).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1555660494 is a wasteful number, since it uses less digits than its factorization.

1555660494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86425591 (or 86425588 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 45.

The square root of 1555660494 is about 39441.8622024873. The cubic root of 1555660494 is about 1158.7016026260.

The spelling of 1555660494 in words is "one billion, five hundred fifty-five million, six hundred sixty thousand, four hundred ninety-four".