15213145551 has 4 divisors (see below), whose sum is σ = 20284194072. Its totient is φ = 10142097032.

The previous prime is 15213145529. The next prime is 15213145559. The reversal of 15213145551 is 15554131251.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 15213145551 - 2¹¹ = 15213143503 is a prime.

It is a super-2 number, since 2×15213145551² (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 (15213145559) 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, 2535524256 + ... + 2535524261.

It is an arithmetic number, because the mean of its divisors is an integer number (5071048518).

Almost surely, 2^15213145551 is an apocalyptic number.

15213145551 is a deficient number, since it is larger than the sum of its proper divisors (5071048521).

15213145551 is an equidigital number, since it uses as much as digits as its factorization.

15213145551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5071048520.

The product of its digits is 15000, while the sum is 33.

The spelling of 15213145551 in words is "fifteen billion, two hundred thirteen million, one hundred forty-five thousand, five hundred fifty-one".