16243087725 has 36 divisors (see below), whose sum is σ = 29121023412. Its totient is φ = 8654688000.

The previous prime is 16243087691. The next prime is 16243087771. The reversal of 16243087725 is 52778034261.

It can be written as a sum of positive squares in 6 ways, for example, as 1000963044 + 15242124681 = 31638^2 + 123459^2 .

It is not a de Polignac number, because 16243087725 - 2¹³ = 16243079533 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 204705 + ... + 272745.

It is an arithmetic number, because the mean of its divisors is an integer number (808917317).

Almost surely, 2^16243087725 is an apocalyptic number.

16243087725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16243087725 is a deficient number, since it is larger than the sum of its proper divisors (12877935687).

16243087725 is a wasteful number, since it uses less digits than its factorization.

16243087725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69118 (or 69110 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 45.

The spelling of 16243087725 in words is "sixteen billion, two hundred forty-three million, eighty-seven thousand, seven hundred twenty-five".