1661300523 has 20 divisors (see below), whose sum is σ = 2482847400. Its totient is φ = 1107019872.

The previous prime is 1661300521. The next prime is 1661300533. The reversal of 1661300523 is 3250031661.

1661300523 is a `hidden beast` number, since 1 + 6 + 6 + 130 + 0 + 523 = 666.

1661300523 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1661300523 - 2¹ = 1661300521 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1661300521) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 264111 + ... + 270327.

It is an arithmetic number, because the mean of its divisors is an integer number (124142370).

Almost surely, 2^1661300523 is an apocalyptic number.

1661300523 is a deficient number, since it is larger than the sum of its proper divisors (821546877).

1661300523 is an equidigital number, since it uses as much as digits as its factorization.

1661300523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9528 (or 9519 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 1661300523 is about 40759.0544909962. The cubic root of 1661300523 is about 1184.3572800499.

The spelling of 1661300523 in words is "one billion, six hundred sixty-one million, three hundred thousand, five hundred twenty-three".