102020019977 has 2 divisors, whose sum is σ = 102020019978. Its totient is φ = 102020019976.

The previous prime is 102020019947. The next prime is 102020020001. The reversal of 102020019977 is 779910020201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77857182841 + 24162837136 = 279029^2 + 155444^2 .

It is a cyclic number.

It is not a de Polignac number, because 102020019977 - 2¹⁰ = 102020018953 is a prime.

It is a super-2 number, since 2×102020019977² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 102020019977.

It is not a weakly prime, because it can be changed into another prime (102020019947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51010009988 + 51010009989.

It is an arithmetic number, because the mean of its divisors is an integer number (51010009989).

Almost surely, 2^102020019977 is an apocalyptic number.

It is an amenable number.

102020019977 is a deficient number, since it is larger than the sum of its proper divisors (1).

102020019977 is an equidigital number, since it uses as much as digits as its factorization.

102020019977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15876, while the sum is 38.

The spelling of 102020019977 in words is "one hundred two billion, twenty million, nineteen thousand, nine hundred seventy-seven".