15655350421 has 2 divisors, whose sum is σ = 15655350422. Its totient is φ = 15655350420.

The previous prime is 15655350397. The next prime is 15655350481. The reversal of 15655350421 is 12405355651.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10421551396 + 5233799025 = 102086^2 + 72345^2 .

It is a cyclic number.

It is not a de Polignac number, because 15655350421 - 2²¹ = 15653253269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15655350481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7827675210 + 7827675211.

It is an arithmetic number, because the mean of its divisors is an integer number (7827675211).

Almost surely, 2^15655350421 is an apocalyptic number.

It is an amenable number.

15655350421 is a deficient number, since it is larger than the sum of its proper divisors (1).

15655350421 is an equidigital number, since it uses as much as digits as its factorization.

15655350421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90000, while the sum is 37.

The spelling of 15655350421 in words is "fifteen billion, six hundred fifty-five million, three hundred fifty thousand, four hundred twenty-one".