15531553423 has 2 divisors, whose sum is σ = 15531553424. Its totient is φ = 15531553422.

The previous prime is 15531553399. The next prime is 15531553441. The reversal of 15531553423 is 32435513551.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15531553423 - 2⁵ = 15531553391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15531553463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7765776711 + 7765776712.

It is an arithmetic number, because the mean of its divisors is an integer number (7765776712).

Almost surely, 2^15531553423 is an apocalyptic number.

15531553423 is a deficient number, since it is larger than the sum of its proper divisors (1).

15531553423 is an equidigital number, since it uses as much as digits as its factorization.

15531553423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 135000, while the sum is 37.

The spelling of 15531553423 in words is "fifteen billion, five hundred thirty-one million, five hundred fifty-three thousand, four hundred twenty-three".