1655228687 has 4 divisors (see below), whose sum is σ = 1891689936. Its totient is φ = 1418767440.

The previous prime is 1655228611. The next prime is 1655228699. The reversal of 1655228687 is 7868225561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7868225561 = 7 ⋅1124032223.

It is a cyclic number.

It is not a de Polignac number, because 1655228687 - 2⁸ = 1655228431 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1655228087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118230614 + ... + 118230627.

It is an arithmetic number, because the mean of its divisors is an integer number (472922484).

Almost surely, 2^1655228687 is an apocalyptic number.

1655228687 is a deficient number, since it is larger than the sum of its proper divisors (236461249).

1655228687 is an equidigital number, since it uses as much as digits as its factorization.

1655228687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236461248.

The product of its digits is 1612800, while the sum is 50.

The square root of 1655228687 is about 40684.5018035124. The cubic root of 1655228687 is about 1182.9126283256.

The spelling of 1655228687 in words is "one billion, six hundred fifty-five million, two hundred twenty-eight thousand, six hundred eighty-seven".