1605161230551 has 96 divisors (see below), whose sum is σ = 2499085255680. Its totient is φ = 989853696000.

The previous prime is 1605161230499. The next prime is 1605161230591. The reversal of 1605161230551 is 1550321615061.

1605161230551 is a `hidden beast` number, since 1 + 6 + 0 + 5 + 1 + 612 + 30 + 5 + 5 + 1 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-1605161230551 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1605161230591) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 457178886 + ... + 457182396.

It is an arithmetic number, because the mean of its divisors is an integer number (26032138080).

Almost surely, 2^{1605161230551} is an apocalyptic number.

1605161230551 is a deficient number, since it is larger than the sum of its proper divisors (893924025129).

1605161230551 is a wasteful number, since it uses less digits than its factorization.

1605161230551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3997 (or 3994 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The spelling of 1605161230551 in words is "one trillion, six hundred five billion, one hundred sixty-one million, two hundred thirty thousand, five hundred fifty-one".