15228517681 has 8 divisors (see below), whose sum is σ = 16400903400. Its totient is φ = 14056269312.

The previous prime is 15228517673. The next prime is 15228517693. The reversal of 15228517681 is 18671582251.

It can be written as a sum of positive squares in 4 ways, for example, as 2450250000 + 12778267681 = 49500^2 + 113041^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15228517681 - 2³ = 15228517673 is a prime.

It is a super-2 number, since 2×15228517681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15228517181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 392931 + ... + 429943.

It is an arithmetic number, because the mean of its divisors is an integer number (2050112925).

Almost surely, 2^15228517681 is an apocalyptic number.

It is an amenable number.

15228517681 is a deficient number, since it is larger than the sum of its proper divisors (1172385719).

15228517681 is a wasteful number, since it uses less digits than its factorization.

15228517681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68675.

The product of its digits is 268800, while the sum is 46.

The spelling of 15228517681 in words is "fifteen billion, two hundred twenty-eight million, five hundred seventeen thousand, six hundred eighty-one".