15840236164 has 9 divisors (see below), whose sum is σ = 27720853797. Its totient is φ = 7919992224.

The previous prime is 15840236119. The next prime is 15840236171. The reversal of 15840236164 is 46163204851.

It is a happy number.

The square root of 15840236164 is 125858.

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

It can be written as a sum of positive squares in only one way, i.e., 10929029764 + 4911206400 = 104542^2 + 70080^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 220252 + ... + 283180.

Almost surely, 2^15840236164 is an apocalyptic number.

15840236164 is the 125858-th square number.

It is an amenable number.

15840236164 is a deficient number, since it is larger than the sum of its proper divisors (11880617633).

15840236164 is an frugal number, since it uses more digits than its factorization.

15840236164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125862 (or 62931 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 40.

It can be divided in two parts, 15840236 and 164, that added together give a square (15840400 = 3980²).

The spelling of 15840236164 in words is "fifteen billion, eight hundred forty million, two hundred thirty-six thousand, one hundred sixty-four".