1655531647 has 16 divisors (see below), whose sum is σ = 2065485312. Its totient is φ = 1289121120.

The previous prime is 1655531639. The next prime is 1655531753. The reversal of 1655531647 is 7461355561.

It is not a de Polignac number, because 1655531647 - 2³ = 1655531639 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1655531627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 116238 + ... + 129700.

It is an arithmetic number, because the mean of its divisors is an integer number (129092832).

Almost surely, 2^1655531647 is an apocalyptic number.

1655531647 is a deficient number, since it is larger than the sum of its proper divisors (409953665).

1655531647 is a wasteful number, since it uses less digits than its factorization.

1655531647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15078.

The product of its digits is 378000, while the sum is 43.

The square root of 1655531647 is about 40688.2249182733. The cubic root of 1655531647 is about 1182.9847942545.

The spelling of 1655531647 in words is "one billion, six hundred fifty-five million, five hundred thirty-one thousand, six hundred forty-seven".