66187101401 has 2 divisors, whose sum is σ = 66187101402. Its totient is φ = 66187101400.

The previous prime is 66187101391. The next prime is 66187101493. The reversal of 66187101401 is 10410178166.

66187101401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66141552400 + 45549001 = 257180^2 + 6749^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66187101401 is a prime.

It is not a weakly prime, because it can be changed into another prime (66187121401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33093550700 + 33093550701.

It is an arithmetic number, because the mean of its divisors is an integer number (33093550701).

Almost surely, 2^66187101401 is an apocalyptic number.

It is an amenable number.

66187101401 is a deficient number, since it is larger than the sum of its proper divisors (1).

66187101401 is an equidigital number, since it uses as much as digits as its factorization.

66187101401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 35.

Adding to 66187101401 its reverse (10410178166), we get a palindrome (76597279567).

The spelling of 66187101401 in words is "sixty-six billion, one hundred eighty-seven million, one hundred one thousand, four hundred one".