1653863974655 has 8 divisors (see below), whose sum is σ = 1999123170192. Its totient is φ = 1313433579328.

The previous prime is 1653863974627. The next prime is 1653863974661. The reversal of 1653863974655 is 5564793683561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1653863974655 - 2¹⁰ = 1653863973631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1207199297 + ... + 1207200666.

It is an arithmetic number, because the mean of its divisors is an integer number (249890396274).

Almost surely, 2^{1653863974655} is an apocalyptic number.

1653863974655 is a deficient number, since it is larger than the sum of its proper divisors (345259195537).

1653863974655 is a wasteful number, since it uses less digits than its factorization.

1653863974655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2414400105.

The product of its digits is 489888000, while the sum is 68.

The spelling of 1653863974655 in words is "one trillion, six hundred fifty-three billion, eight hundred sixty-three million, nine hundred seventy-four thousand, six hundred fifty-five".