1663924293661 has 16 divisors (see below), whose sum is σ = 1984620109824. Its totient is φ = 1363996119024.

The previous prime is 1663924293643. The next prime is 1663924293697.

1663924293661 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1663924293661 - 2¹³ = 1663924285469 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1663924293596 and 1663924293605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663924293611) 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, 213486 + ... + 1836688.

It is an arithmetic number, because the mean of its divisors is an integer number (124038756864).

Almost surely, 2^{1663924293661} is an apocalyptic number.

It is an amenable number.

1663924293661 is a deficient number, since it is larger than the sum of its proper divisors (320695816163).

1663924293661 is a wasteful number, since it uses less digits than its factorization.

1663924293661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1629600.

The product of its digits is 15116544, while the sum is 58.

The spelling of 1663924293661 in words is "one trillion, six hundred sixty-three billion, nine hundred twenty-four million, two hundred ninety-three thousand, six hundred sixty-one".