15501605551 has 2 divisors, whose sum is σ = 15501605552. Its totient is φ = 15501605550.

The previous prime is 15501605531. The next prime is 15501605627. The reversal of 15501605551 is 15550610551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 15501605551 - 2¹³ = 15501597359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15501605531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7750802775 + 7750802776.

It is an arithmetic number, because the mean of its divisors is an integer number (7750802776).

Almost surely, 2^15501605551 is an apocalyptic number.

15501605551 is a deficient number, since it is larger than the sum of its proper divisors (1).

15501605551 is an equidigital number, since it uses as much as digits as its factorization.

15501605551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18750, while the sum is 34.

The spelling of 15501605551 in words is "fifteen billion, five hundred one million, six hundred five thousand, five hundred fifty-one".