1655009879 has 2 divisors, whose sum is σ = 1655009880. Its totient is φ = 1655009878.

The previous prime is 1655009861. The next prime is 1655009987. The reversal of 1655009879 is 9789005561.

It is a happy number.

Together with next prime (1655009987) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1655009879 - 2²⁴ = 1638232663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1655009809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 827504939 + 827504940.

It is an arithmetic number, because the mean of its divisors is an integer number (827504940).

Almost surely, 2^1655009879 is an apocalyptic number.

1655009879 is a deficient number, since it is larger than the sum of its proper divisors (1).

1655009879 is an equidigital number, since it uses as much as digits as its factorization.

1655009879 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 680400, while the sum is 50.

The square root of 1655009879 is about 40681.8126316908. The cubic root of 1655009879 is about 1182.8605021643.

The spelling of 1655009879 in words is "one billion, six hundred fifty-five million, nine thousand, eight hundred seventy-nine".