15445021012 has 6 divisors (see below), whose sum is σ = 27028786778. Its totient is φ = 7722510504.

The previous prime is 15445020971. The next prime is 15445021013. The reversal of 15445021012 is 21012054451.

It can be written as a sum of positive squares in only one way, i.e., 15268556356 + 176464656 = 123566^2 + 13284^2 .

It is a super-2 number, since 2×15445021012² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15445021013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1930627623 + ... + 1930627630.

Almost surely, 2^15445021012 is an apocalyptic number.

It is an amenable number.

15445021012 is a deficient number, since it is larger than the sum of its proper divisors (11583765766).

15445021012 is a wasteful number, since it uses less digits than its factorization.

15445021012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3861255257 (or 3861255255 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 25.

Adding to 15445021012 its reverse (21012054451), we get a palindrome (36457075463).

The spelling of 15445021012 in words is "fifteen billion, four hundred forty-five million, twenty-one thousand, twelve".