15535042420 has 12 divisors (see below), whose sum is σ = 32623589124. Its totient is φ = 6214016960.

The previous prime is 15535042417. The next prime is 15535042423. The reversal of 15535042420 is 2424053551.

It is an interprime number because it is at equal distance from previous prime (15535042417) and next prime (15535042423).

It can be written as a sum of positive squares in 2 ways, for example, as 6088368784 + 9446673636 = 78028^2 + 97194^2 .

It is a super-4 number, since 4×15535042420⁴ (a number of 42 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15535042423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 388376041 + ... + 388376080.

It is an arithmetic number, because the mean of its divisors is an integer number (2718632427).

Almost surely, 2^15535042420 is an apocalyptic number.

15535042420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15535042420 is an abundant number, since it is smaller than the sum of its proper divisors (17088546704).

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

15535042420 is a wasteful number, since it uses less digits than its factorization.

15535042420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 776752130 (or 776752128 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 31.

Adding to 15535042420 its reverse (2424053551), we get a palindrome (17959095971).

The spelling of 15535042420 in words is "fifteen billion, five hundred thirty-five million, forty-two thousand, four hundred twenty".