1623663261 has 24 divisors (see below), whose sum is σ = 2582427744. Its totient is φ = 974835360.

The previous prime is 1623663253. The next prime is 1623663271.

1623663261 is a `hidden beast` number, since 1 + 623 + 6 + 6 + 3 + 26 + 1 = 666.

1623663261 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1623663261 - 2³ = 1623663253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1623663211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 66046 + ... + 87231.

It is an arithmetic number, because the mean of its divisors is an integer number (107601156).

Almost surely, 2^1623663261 is an apocalyptic number.

1623663261 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1623663261 is a deficient number, since it is larger than the sum of its proper divisors (958764483).

1623663261 is a wasteful number, since it uses less digits than its factorization.

1623663261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153401 (or 153398 counting only the distinct ones).

The product of its digits is 46656, while the sum is 36.

The square root of 1623663261 is about 40294.7051236264. The cubic root of 1623663261 is about 1175.3448840628.

It can be divided in two parts, 16236 and 63261, that added together give a palindrome (79497).

The spelling of 1623663261 in words is "one billion, six hundred twenty-three million, six hundred sixty-three thousand, two hundred sixty-one".