1605978455 has 8 divisors (see below), whose sum is σ = 1927716000. Its totient is φ = 1284421536.

The previous prime is 1605978449. The next prime is 1605978461. The reversal of 1605978455 is 5548795061.

It is an interprime number because it is at equal distance from previous prime (1605978449) and next prime (1605978461).

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1605978455 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24755 + ... + 61844.

It is an arithmetic number, because the mean of its divisors is an integer number (240964500).

Almost surely, 2^1605978455 is an apocalyptic number.

1605978455 is a deficient number, since it is larger than the sum of its proper divisors (321737545).

1605978455 is an equidigital number, since it uses as much as digits as its factorization.

1605978455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90313.

The product of its (nonzero) digits is 1512000, while the sum is 50.

The square root of 1605978455 is about 40074.6610091714. The cubic root of 1605978455 is about 1171.0620436711.

The spelling of 1605978455 in words is "one billion, six hundred five million, nine hundred seventy-eight thousand, four hundred fifty-five".