6985781801 has 2 divisors, whose sum is σ = 6985781802. Its totient is φ = 6985781800.

The previous prime is 6985781773. The next prime is 6985781807. The reversal of 6985781801 is 1081875896.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4897200400 + 2088581401 = 69980^2 + 45701^2 .

It is a cyclic number.

It is not a de Polignac number, because 6985781801 - 2²² = 6981587497 is a prime.

It is a super-2 number, since 2×6985781801² = 97602294742365607202, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (6985781807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3492890900 + 3492890901.

It is an arithmetic number, because the mean of its divisors is an integer number (3492890901).

Almost surely, 2^6985781801 is an apocalyptic number.

It is an amenable number.

6985781801 is a deficient number, since it is larger than the sum of its proper divisors (1).

6985781801 is an equidigital number, since it uses as much as digits as its factorization.

6985781801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 967680, while the sum is 53.

The square root of 6985781801 is about 83580.9894712907. The cubic root of 6985781801 is about 1911.6351412518.

The spelling of 6985781801 in words is "six billion, nine hundred eighty-five million, seven hundred eighty-one thousand, eight hundred one".