15220423501 has 4 divisors (see below), whose sum is σ = 15297684732. Its totient is φ = 15143162272.

The previous prime is 15220423487. The next prime is 15220423513. The reversal of 15220423501 is 10532402251.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10532402251 = 7 ⋅1504628893.

It can be written as a sum of positive squares in 2 ways, for example, as 6777570276 + 8442853225 = 82326^2 + 91885^2 .

It is a cyclic number.

It is not a de Polignac number, because 15220423501 - 2¹⁵ = 15220390733 is a prime.

It is a super-2 number, since 2×15220423501² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15220423541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38630320 + ... + 38630713.

It is an arithmetic number, because the mean of its divisors is an integer number (3824421183).

Almost surely, 2^15220423501 is an apocalyptic number.

It is an amenable number.

15220423501 is a deficient number, since it is larger than the sum of its proper divisors (77261231).

15220423501 is an equidigital number, since it uses as much as digits as its factorization.

15220423501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77261230.

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 15220423501 its reverse (10532402251), we get a palindrome (25752825752).

The spelling of 15220423501 in words is "fifteen billion, two hundred twenty million, four hundred twenty-three thousand, five hundred one".