633670781377 has 2 divisors, whose sum is σ = 633670781378. Its totient is φ = 633670781376.

The previous prime is 633670781353. The next prime is 633670781413. The reversal of 633670781377 is 773187076336.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 499984753216 + 133686028161 = 707096^2 + 365631^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-633670781377 is a prime.

It is a super-2 number, since 2×633670781377² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (633670781477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 316835390688 + 316835390689.

It is an arithmetic number, because the mean of its divisors is an integer number (316835390689).

Almost surely, 2^633670781377 is an apocalyptic number.

It is an amenable number.

633670781377 is a deficient number, since it is larger than the sum of its proper divisors (1).

633670781377 is an equidigital number, since it uses as much as digits as its factorization.

633670781377 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18670176, while the sum is 58.

The spelling of 633670781377 in words is "six hundred thirty-three billion, six hundred seventy million, seven hundred eighty-one thousand, three hundred seventy-seven".