15541890243601 has 2 divisors, whose sum is σ = 15541890243602. Its totient is φ = 15541890243600.

The previous prime is 15541890243589. The next prime is 15541890243619. The reversal of 15541890243601 is 10634209814551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8773562480400 + 6768327763201 = 2962020^2 + 2601601^2 .

It is a cyclic number.

It is not a de Polignac number, because 15541890243601 - 2¹⁹ = 15541889719313 is a prime.

It is a super-2 number, since 2×15541890243601² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (15541890243401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7770945121800 + 7770945121801.

It is an arithmetic number, because the mean of its divisors is an integer number (7770945121801).

Almost surely, 2^{15541890243601} is an apocalyptic number.

It is an amenable number.

15541890243601 is a deficient number, since it is larger than the sum of its proper divisors (1).

15541890243601 is an equidigital number, since it uses as much as digits as its factorization.

15541890243601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1036800, while the sum is 49.

The spelling of 15541890243601 in words is "fifteen trillion, five hundred forty-one billion, eight hundred ninety million, two hundred forty-three thousand, six hundred one".