283642521561 has 45 divisors (see below), whose sum is σ = 478093695989. Its totient is φ = 162036704088.

The previous prime is 283642521493. The next prime is 283642521563. The reversal of 283642521561 is 165125246382.

The square root of 283642521561 is 532581.

It is a perfect power (a square), and thus also a powerful number.

283642521561 is a `hidden beast` number, since 2 + 8 + 3 + 6 + 425 + 215 + 6 + 1 = 666.

It is not a de Polignac number, because 283642521561 - 2⁷ = 283642521433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (283642521563) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 78287596 + ... + 78291218.

Almost surely, 2^283642521561 is an apocalyptic number.

283642521561 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

283642521561 is the 532581-st square number.

283642521561 is the 266291-st centered octagonal number.

It is an amenable number.

283642521561 is a deficient number, since it is larger than the sum of its proper divisors (194451174428).

283642521561 is an frugal number, since it uses more digits than its factorization.

283642521561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7280 (or 3633 counting only the distinct ones).

The product of its digits is 691200, while the sum is 45.

The spelling of 283642521561 in words is "two hundred eighty-three billion, six hundred forty-two million, five hundred twenty-one thousand, five hundred sixty-one".