66103262420401 has 4 divisors (see below), whose sum is σ = 66103638198052. Its totient is φ = 66102886642752.

The previous prime is 66103262420369. The next prime is 66103262420431. The reversal of 66103262420401 is 10402426230166.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14867386430625 + 51235875989776 = 3855825^2 + 7157924^2 .

It is a cyclic number.

It is not a de Polignac number, because 66103262420401 - 2⁵ = 66103262420369 is a prime.

It is a super-2 number, since 2×66103262420401² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66103262420431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 187624836 + ... + 187976821.

It is an arithmetic number, because the mean of its divisors is an integer number (16525909549513).

Almost surely, 2^{66103262420401} is an apocalyptic number.

It is an amenable number.

66103262420401 is a deficient number, since it is larger than the sum of its proper divisors (375777651).

66103262420401 is a wasteful number, since it uses less digits than its factorization.

66103262420401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375777650.

The product of its (nonzero) digits is 82944, while the sum is 37.

Adding to 66103262420401 its reverse (10402426230166), we get a palindrome (76505688650567).

The spelling of 66103262420401 in words is "sixty-six trillion, one hundred three billion, two hundred sixty-two million, four hundred twenty thousand, four hundred one".