1661145354 has 192 divisors, whose sum is σ = 4290048000. Its totient is φ = 475437600.

The previous prime is 1661145347. The next prime is 1661145371. The reversal of 1661145354 is 4535411661.

1661145354 is a `hidden beast` number, since 1 + 6 + 6 + 114 + 535 + 4 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 11950617 + ... + 11950755.

It is an arithmetic number, because the mean of its divisors is an integer number (22344000).

Almost surely, 2^1661145354 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1661145354, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2145024000).

1661145354 is an abundant number, since it is smaller than the sum of its proper divisors (2628902646).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1661145354 is a wasteful number, since it uses less digits than its factorization.

1661145354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262 (or 245 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 1661145354 is about 40757.1509553845. The cubic root of 1661145354 is about 1184.3204050727.

The spelling of 1661145354 in words is "one billion, six hundred sixty-one million, one hundred forty-five thousand, three hundred fifty-four".