15238904919616 has 63 divisors (see below), whose sum is σ = 35177300776449. Its totient is φ = 6530865562368.

The previous prime is 15238904919611. The next prime is 15238904919709. The reversal of 15238904919616 is 61691940983251.

The square root of 15238904919616 is 3903704.

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., 126093169216 + 15112811750400 = 355096^2 + 3887520^2 .

It is a Harshad number since it is a multiple of its sum of digits (64).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15238904919611) 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, 218572570 + ... + 218642278.

Almost surely, 2^{15238904919616} is an apocalyptic number.

15238904919616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

15238904919616 is the 3903704-th square number.

It is an amenable number.

15238904919616 is an abundant number, since it is smaller than the sum of its proper divisors (19938395856833).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15238904919616 is an frugal number, since it uses more digits than its factorization.

15238904919616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139444 (or 69718 counting only the distinct ones).

The product of its (nonzero) digits is 25194240, while the sum is 64.

Multiplying 15238904919616 by its sum of digits (64), we get a square (975289914855424 = 31229632²).

15238904919616 divided by its sum of digits (64) gives a square (238107889369 = 487963²).

The spelling of 15238904919616 in words is "fifteen trillion, two hundred thirty-eight billion, nine hundred four million, nine hundred nineteen thousand, six hundred sixteen".