1661622363 has 16 divisors (see below), whose sum is σ = 2463141760. Its totient is φ = 1107082728.

The previous prime is 1661622359. The next prime is 1661622421. The reversal of 1661622363 is 3632261661.

1661622363 is a `hidden beast` number, since 1 + 6 + 616 + 2 + 2 + 36 + 3 = 666.

It is not a de Polignac number, because 1661622363 - 2² = 1661622359 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1661622323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29556 + ... + 64782.

It is an arithmetic number, because the mean of its divisors is an integer number (153946360).

Almost surely, 2^1661622363 is an apocalyptic number.

1661622363 is a deficient number, since it is larger than the sum of its proper divisors (801519397).

1661622363 is a wasteful number, since it uses less digits than its factorization.

1661622363 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36983 (or 36977 counting only the distinct ones).

The product of its digits is 46656, while the sum is 36.

The square root of 1661622363 is about 40763.0023796089. The cubic root of 1661622363 is about 1184.4337560657.

The spelling of 1661622363 in words is "one billion, six hundred sixty-one million, six hundred twenty-two thousand, three hundred sixty-three".