15554345406601 has 2 divisors, whose sum is σ = 15554345406602. Its totient is φ = 15554345406600.

The previous prime is 15554345406571. The next prime is 15554345406637. The reversal of 15554345406601 is 10660454345551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12100824933376 + 3453520473225 = 3478624^2 + 1858365^2 .

It is a cyclic number.

It is not a de Polignac number, because 15554345406601 - 2⁷ = 15554345406473 is a prime.

It is a super-2 number, since 2×15554345406601² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (15554345406701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7777172703300 + 7777172703301.

It is an arithmetic number, because the mean of its divisors is an integer number (7777172703301).

Almost surely, 2^{15554345406601} is an apocalyptic number.

It is an amenable number.

15554345406601 is a deficient number, since it is larger than the sum of its proper divisors (1).

15554345406601 is an equidigital number, since it uses as much as digits as its factorization.

15554345406601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320000, while the sum is 49.

The spelling of 15554345406601 in words is "fifteen trillion, five hundred fifty-four billion, three hundred forty-five million, four hundred six thousand, six hundred one".