1613642563 has 16 divisors (see below), whose sum is σ = 1806900480. Its totient is φ = 1430787456.

The previous prime is 1613642561. The next prime is 1613642603. The reversal of 1613642563 is 3652463161.

It is a cyclic number.

It is not a de Polignac number, because 1613642563 - 2¹ = 1613642561 is a prime.

It is a super-2 number, since 2×1613642563² = 5207684642250417938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1613642561) 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, 63406 + ... + 85132.

It is an arithmetic number, because the mean of its divisors is an integer number (112931280).

Almost surely, 2^1613642563 is an apocalyptic number.

1613642563 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1613642563 is a deficient number, since it is larger than the sum of its proper divisors (193257917).

1613642563 is a wasteful number, since it uses less digits than its factorization.

1613642563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21966.

The product of its digits is 77760, while the sum is 37.

The square root of 1613642563 is about 40170.1700643649. The cubic root of 1613642563 is about 1172.9219495975.

The spelling of 1613642563 in words is "one billion, six hundred thirteen million, six hundred forty-two thousand, five hundred sixty-three".