1663736534 has 4 divisors (see below), whose sum is σ = 2495604804. Its totient is φ = 831868266.

The previous prime is 1663736507. The next prime is 1663736537. The reversal of 1663736534 is 4356373661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4356373661 = 41887 ⋅104003.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663736537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 415934132 + ... + 415934135.

It is an arithmetic number, because the mean of its divisors is an integer number (623901201).

Almost surely, 2^1663736534 is an apocalyptic number.

1663736534 is a deficient number, since it is larger than the sum of its proper divisors (831868270).

1663736534 is an equidigital number, since it uses as much as digits as its factorization.

1663736534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 831868269.

The product of its digits is 816480, while the sum is 44.

The square root of 1663736534 is about 40788.9266100494. The cubic root of 1663736534 is about 1184.9358826365.

The spelling of 1663736534 in words is "one billion, six hundred sixty-three million, seven hundred thirty-six thousand, five hundred thirty-four".