15843508641 has 9 divisors (see below), whose sum is σ = 22885613491. Its totient is φ = 10562087352.

The previous prime is 15843508631. The next prime is 15843508643. The reversal of 15843508641 is 14680534851.

The square root of 15843508641 is 125871.

It is a perfect power (a square), and thus also a powerful number.

15843508641 is a `hidden beast` number, since 1 + 5 + 84 + 3 + 508 + 64 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 8651790225 + 7191718416 = 93015^2 + 84804^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 15843508641 - 2²⁷ = 15709290913 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (15843508643) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 356635 + ... + 398591.

Almost surely, 2^15843508641 is an apocalyptic number.

15843508641 is the 125871-st square number.

15843508641 is the 62936-th centered octagonal number.

It is an amenable number.

15843508641 is a deficient number, since it is larger than the sum of its proper divisors (7042104850).

15843508641 is an frugal number, since it uses more digits than its factorization.

15843508641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83920 (or 41960 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 45.

The spelling of 15843508641 in words is "fifteen billion, eight hundred forty-three million, five hundred eight thousand, six hundred forty-one".