1863561063 has 64 divisors (see below), whose sum is σ = 3342753792. Its totient is φ = 895242240.

The previous prime is 1863561031. The next prime is 1863561109. The reversal of 1863561063 is 3601653681.

It is not a de Polignac number, because 1863561063 - 2⁵ = 1863561031 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1863561013) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 137395 + ... + 150347.

It is an arithmetic number, because the mean of its divisors is an integer number (52230528).

Almost surely, 2^1863561063 is an apocalyptic number.

1863561063 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1863561063 is a deficient number, since it is larger than the sum of its proper divisors (1479192729).

1863561063 is a wasteful number, since it uses less digits than its factorization.

1863561063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13024.

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 1863561063 is about 43168.9826495830. The cubic root of 1863561063 is about 1230.5932896949.

The spelling of 1863561063 in words is "one billion, eight hundred sixty-three million, five hundred sixty-one thousand, sixty-three".