61620236101 has 2 divisors, whose sum is σ = 61620236102. Its totient is φ = 61620236100.

The previous prime is 61620236009. The next prime is 61620236113. The reversal of 61620236101 is 10163202616.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41360983876 + 20259252225 = 203374^2 + 142335^2 .

It is a cyclic number.

It is not a de Polignac number, because 61620236101 - 2³¹ = 59472752453 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61620236101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61620236191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30810118050 + 30810118051.

It is an arithmetic number, because the mean of its divisors is an integer number (30810118051).

Almost surely, 2^61620236101 is an apocalyptic number.

It is an amenable number.

61620236101 is a deficient number, since it is larger than the sum of its proper divisors (1).

61620236101 is an equidigital number, since it uses as much as digits as its factorization.

61620236101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 28.

Adding to 61620236101 its reverse (10163202616), we get a palindrome (71783438717).

The spelling of 61620236101 in words is "sixty-one billion, six hundred twenty million, two hundred thirty-six thousand, one hundred one".