15525420643 has 2 divisors, whose sum is σ = 15525420644. Its totient is φ = 15525420642.

The previous prime is 15525420607. The next prime is 15525420649. The reversal of 15525420643 is 34602452551.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15525420643 - 2²⁵ = 15491866211 is a prime.

It is a super-2 number, since 2×15525420643² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (15525420649) 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 as a sum of consecutive naturals, namely, 7762710321 + 7762710322.

It is an arithmetic number, because the mean of its divisors is an integer number (7762710322).

Almost surely, 2^15525420643 is an apocalyptic number.

15525420643 is a deficient number, since it is larger than the sum of its proper divisors (1).

15525420643 is an equidigital number, since it uses as much as digits as its factorization.

15525420643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144000, while the sum is 37.

The spelling of 15525420643 in words is "fifteen billion, five hundred twenty-five million, four hundred twenty thousand, six hundred forty-three".